This diff converts the current print code of -f to use json_do api.
I did some minimal refactoring to reduce code repetition and more is for
sure possible. I changed the way how the errstr is dumped but apart from
that the objects remain the same (apart from spacing differences).

-- 
:wq Claudio

Index: filemode.c
===================================================================
RCS file: /cvs/src/usr.sbin/rpki-client/filemode.c,v
retrieving revision 1.30
diff -u -p -r1.30 filemode.c
--- filemode.c  26 Apr 2023 16:32:41 -0000      1.30
+++ filemode.c  30 Apr 2023 15:41:39 -0000
@@ -39,6 +39,7 @@
 #include <openssl/x509v3.h>
 
 #include "extern.h"
+#include "json.h"
 
 extern int              verbose;
 
@@ -302,15 +303,17 @@ proc_parser_file(char *file, unsigned ch
        time_t *expires = NULL, *notafter = NULL;
        struct auth *a;
        struct crl *c;
-       const char *errstr = NULL;
+       const char *errstr = NULL, *valid;
        int status = 0;
        char filehash[SHA256_DIGEST_LENGTH];
        char *hash;
        enum rtype type;
        int is_ta = 0;
 
-       if (num++ > 0) {
-               if ((outformats & FORMAT_JSON) == 0)
+       if (outformats & FORMAT_JSON) {
+               json_do_start(stdout);
+       } else {
+               if (num++ > 0)
                        printf("--\n");
        }
 
@@ -330,8 +333,8 @@ proc_parser_file(char *file, unsigned ch
                errx(1, "base64_encode failed in %s", __func__);
 
        if (outformats & FORMAT_JSON) {
-               printf("{\n\t\"file\": \"%s\",\n", file);
-               printf("\t\"hash_id\": \"%s\",\n", hash);
+               json_do_string("file", file);
+               json_do_string("hash_id", hash);
        } else {
                printf("File:                     %s\n", file);
                printf("Hash identifier:          %s\n", hash);
@@ -470,7 +473,7 @@ proc_parser_file(char *file, unsigned ch
                        cert = ta_parse(file, cert, tal->pkey, tal->pkeysz);
                        status = (cert != NULL);
                        if (outformats & FORMAT_JSON)
-                               printf("\t\"tal\": \"%s\",\n", tal->descr);
+                               json_do_string("tal", tal->descr);
                        else
                                printf("TAL:                      %s\n",
                                    tal->descr);
@@ -516,25 +519,25 @@ proc_parser_file(char *file, unsigned ch
                }
        }
 
-       if (outformats & FORMAT_JSON)
-               printf("\t\"validation\": \"");
+       if (status)
+               valid = "OK";
+       else if (aia == NULL)
+               valid = "N/A";
        else
-               printf("Validation:               ");
+               valid = "Failed";
 
-       if (status)
-               printf("OK");
-       else {
-               if (aia == NULL)
-                       printf("N/A");
-               else {
-                       printf("Failed");
-                       if (errstr != NULL)
-                               printf(", %s", errstr);
-               }
+       if (outformats & FORMAT_JSON) {
+               json_do_string("validation", valid);
+               if (errstr != NULL)
+                       json_do_string("error", errstr);
+       } else {
+               printf("Validation:               %s", valid);
+               if (errstr != NULL)
+                       printf(", %s", errstr);
        }
 
        if (outformats & FORMAT_JSON)
-               printf("\"\n}\n");
+               json_do_finish();
        else {
                printf("\n");
 
Index: print.c
===================================================================
RCS file: /cvs/src/usr.sbin/rpki-client/print.c,v
retrieving revision 1.38
diff -u -p -r1.38 print.c
--- print.c     26 Apr 2023 18:17:50 -0000      1.38
+++ print.c     30 Apr 2023 15:30:43 -0000
@@ -28,6 +28,7 @@
 #include <openssl/evp.h>
 
 #include "extern.h"
+#include "json.h"
 
 static const char *
 pretty_key_id(const char *hex)
@@ -91,16 +92,13 @@ tal_print(const struct tal *p)
        ski = hex_encode(md, SHA_DIGEST_LENGTH);
 
        if (outformats & FORMAT_JSON) {
-               printf("\t\"type\": \"tal\",\n");
-               printf("\t\"name\": \"%s\",\n", p->descr);
-               printf("\t\"ski\": \"%s\",\n", pretty_key_id(ski));
-               printf("\t\"trust_anchor_locations\": [");
-               for (i = 0; i < p->urisz; i++) {
-                       printf("\"%s\"", p->uri[i]);
-                       if (i + 1 < p->urisz)
-                               printf(", ");
-               }
-               printf("],\n");
+               json_do_string("type", "tal");
+               json_do_string("name", p->descr);
+               json_do_string("ski", pretty_key_id(ski));
+               json_do_array("trust_anchor_locations");
+               for (i = 0; i < p->urisz; i++)
+                       json_do_string("tal", p->uri[i]);
+               json_do_end();
        } else {
                printf("Trust anchor name:        %s\n", p->descr);
                printf("Subject key identifier:   %s\n", pretty_key_id(ski));
@@ -144,8 +142,8 @@ x509_print(const X509 *x)
                goto out;
 
        if (outformats & FORMAT_JSON) {
-               printf("\t\"cert_issuer\": \"%s\",\n", issuer);
-               printf("\t\"cert_serial\": \"%s\",\n", serial);
+               json_do_string("cert_issuer", issuer);
+               json_do_string("cert_serial", serial);
        } else {
                printf("Certificate issuer:       %s\n", issuer);
                printf("Certificate serial:       %s\n", serial);
@@ -156,37 +154,137 @@ x509_print(const X509 *x)
        free(serial);
 }
 
+static void
+as_resources_print(struct cert_as *as, size_t asz)
+{
+       size_t i;
+
+       for (i = 0; i < asz; i++) {
+               if (outformats & FORMAT_JSON)
+                       json_do_object("resource");
+               switch (as[i].type) {
+               case CERT_AS_ID:
+                       if (outformats & FORMAT_JSON) {
+                               json_do_uint("asid", as[i].id);
+                       } else {
+                               if (i > 0)
+                                       printf("%26s", "");
+                               printf("AS: %u", as[i].id);
+                       }
+                       break;
+               case CERT_AS_INHERIT:
+                       if (outformats & FORMAT_JSON) {
+                               json_do_bool("asid_inherit", 1);
+                       } else {
+                               if (i > 0)
+                                       printf("%26s", "");
+                               printf("AS: inherit");
+                       }
+                       break;
+               case CERT_AS_RANGE:
+                       if (outformats & FORMAT_JSON) {
+                               json_do_object("asrange");
+                               json_do_uint("min", as[i].range.min);
+                               json_do_uint("max", as[i].range.max);
+                               json_do_end();
+                       } else {
+                               if (i > 0)
+                                       printf("%26s", "");
+                               printf("AS: %u -- %u", as[i].range.min,
+                                   as[i].range.max);
+                       }
+                       break;
+               }
+               if (outformats & FORMAT_JSON)
+                       json_do_end();
+               else
+                       printf("\n");
+       }
+}
+
+static void
+ip_resources_print(struct cert_ip *ips, size_t ipsz, size_t asz)
+{
+       char buf1[64], buf2[64];
+       size_t i;
+       int sockt;
+
+
+       for (i = 0; i < ipsz; i++) {
+               if (outformats & FORMAT_JSON)
+                       json_do_object("resource");
+               switch (ips[i].type) {
+               case CERT_IP_INHERIT:
+                       if (outformats & FORMAT_JSON) {
+                               json_do_bool("ip_inherit", 1);
+                       } else {
+                               if (i > 0 || asz > 0)
+                                       printf("%26s", "");
+                               printf("IP: inherit");
+                       }
+                       break;
+               case CERT_IP_ADDR:
+                       ip_addr_print(&ips[i].ip, ips[i].afi, buf1,
+                           sizeof(buf1));
+                       if (outformats & FORMAT_JSON) {
+                               json_do_string("ip_prefix", buf1);
+                       } else {
+                               if (i > 0 || asz > 0)
+                                       printf("%26s", "");
+                               printf("IP: %s", buf1);
+                       }
+                       break;
+               case CERT_IP_RANGE:
+                       sockt = (ips[i].afi == AFI_IPV4) ?
+                           AF_INET : AF_INET6;
+                       inet_ntop(sockt, ips[i].min, buf1, sizeof(buf1));
+                       inet_ntop(sockt, ips[i].max, buf2, sizeof(buf2));
+                       if (outformats & FORMAT_JSON) {
+                               json_do_object("ip_range");
+                               json_do_string("min", buf1);
+                               json_do_string("max", buf2);
+                               json_do_end();
+                       } else {
+                               if (i > 0 || asz > 0)
+                                       printf("%26s", "");
+                               printf("IP: %s -- %s", buf1, buf2);
+                       }
+                       break;
+               }
+               if (outformats & FORMAT_JSON)
+                       json_do_end();
+               else
+                       printf("\n");
+       }
+}
+
 void
 cert_print(const struct cert *p)
 {
-       size_t                   i, j;
-       char                     buf1[64], buf2[64];
-       int                      sockt;
-
        if (outformats & FORMAT_JSON) {
                if (p->pubkey != NULL)
-                       printf("\t\"type\": \"router_key\",\n");
+                       json_do_string("type", "router_key");
                else
-                       printf("\t\"type\": \"ca_cert\",\n");
-               printf("\t\"ski\": \"%s\",\n", pretty_key_id(p->ski));
+                       json_do_string("type", "ca_cert");
+               json_do_string("ski", pretty_key_id(p->ski));
                if (p->aki != NULL)
-                       printf("\t\"aki\": \"%s\",\n", pretty_key_id(p->aki));
+                       json_do_string("aki", pretty_key_id(p->aki));
                x509_print(p->x509);
                if (p->aia != NULL)
-                       printf("\t\"aia\": \"%s\",\n", p->aia);
+                       json_do_string("aia", p->aia);
                if (p->mft != NULL)
-                       printf("\t\"manifest\": \"%s\",\n", p->mft);
+                       json_do_string("manifest", p->mft);
                if (p->repo != NULL)
-                       printf("\t\"carepository\": \"%s\",\n", p->repo);
+                       json_do_string("carepository", p->repo);
                if (p->notify != NULL)
-                       printf("\t\"notify_url\": \"%s\",\n", p->notify);
+                       json_do_string("notify_url", p->notify);
                if (p->pubkey != NULL)
-                       printf("\t\"router_key\": \"%s\",\n", p->pubkey);
-               printf("\t\"valid_since\": %lld,\n", (long long)p->notbefore);
-               printf("\t\"valid_until\": %lld,\n", (long long)p->notafter);
+                       json_do_string("router_key", p->pubkey);
+               json_do_int("valid_since", p->notbefore);
+               json_do_int("valid_until", p->notafter);
                if (p->expires)
-                       printf("\t\"expires\": %lld,\n", (long long)p->expires);
-               printf("\t\"subordinate_resources\": [\n");
+                       json_do_int("expires", p->expires);
+               json_do_array("subordinate_resources");
        } else {
                printf("Subject key identifier:   %s\n", pretty_key_id(p->ski));
                if (p->aki != NULL)
@@ -217,90 +315,11 @@ cert_print(const struct cert *p)
                printf("Subordinate resources:    ");
        }
 
-       for (i = 0; i < p->asz; i++) {
-               switch (p->as[i].type) {
-               case CERT_AS_ID:
-                       if (outformats & FORMAT_JSON)
-                               printf("\t\t{ \"asid\": %u }", p->as[i].id);
-                       else {
-                               if (i > 0)
-                                       printf("%26s", "");
-                               printf("AS: %u", p->as[i].id);
-                       }
-                       break;
-               case CERT_AS_INHERIT:
-                       if (outformats & FORMAT_JSON)
-                               printf("\t\t{ \"asid_inherit\": \"true\" }");
-                       else {
-                               if (i > 0)
-                                       printf("%26s", "");
-                               printf("AS: inherit");
-                       }
-                       break;
-               case CERT_AS_RANGE:
-                       if (outformats & FORMAT_JSON)
-                               printf("\t\t{ \"asrange\": { \"min\": %u, "
-                                   "\"max\": %u }}", p->as[i].range.min,
-                                   p->as[i].range.max);
-                       else {
-                               if (i > 0)
-                                       printf("%26s", "");
-                               printf("AS: %u -- %u", p->as[i].range.min,
-                                   p->as[i].range.max);
-                       }
-                       break;
-               }
-               if (outformats & FORMAT_JSON && i + 1 < p->asz + p->ipsz)
-                       printf(",\n");
-               else
-                       printf("\n");
-       }
-
-       for (j = 0; j < p->ipsz; j++) {
-               switch (p->ips[j].type) {
-               case CERT_IP_INHERIT:
-                       if (outformats & FORMAT_JSON)
-                               printf("\t\t{ \"ip_inherit\": \"true\" }");
-                       else {
-                               if (i > 0 || j > 0)
-                                       printf("%26s", "");
-                               printf("IP: inherit");
-                       }
-                       break;
-               case CERT_IP_ADDR:
-                       ip_addr_print(&p->ips[j].ip,
-                           p->ips[j].afi, buf1, sizeof(buf1));
-                       if (outformats & FORMAT_JSON)
-                               printf("\t\t{ \"ip_prefix\": \"%s\" }", buf1);
-                       else {
-                               if (i > 0 || j > 0)
-                                       printf("%26s", "");
-                               printf("IP: %s", buf1);
-                       }
-                       break;
-               case CERT_IP_RANGE:
-                       sockt = (p->ips[j].afi == AFI_IPV4) ?
-                           AF_INET : AF_INET6;
-                       inet_ntop(sockt, p->ips[j].min, buf1, sizeof(buf1));
-                       inet_ntop(sockt, p->ips[j].max, buf2, sizeof(buf2));
-                       if (outformats & FORMAT_JSON)
-                               printf("\t\t{ \"ip_range\": { \"min\": \"%s\""
-                                   ", \"max\": \"%s\" }}", buf1, buf2);
-                       else {
-                               if (i > 0 || j > 0)
-                                       printf("%26s", "");
-                               printf("IP: %s -- %s", buf1, buf2);
-                       }
-                       break;
-               }
-               if (outformats & FORMAT_JSON && i + j + 1 < p->asz + p->ipsz)
-                       printf(",\n");
-               else
-                       printf("\n");
-       }
+       as_resources_print(p->as, p->asz);
+       ip_resources_print(p->ips, p->ipsz, p->asz);
 
        if (outformats & FORMAT_JSON)
-               printf("\t],\n");
+               json_do_end();
 }
 
 void
@@ -315,8 +334,8 @@ crl_print(const struct crl *p)
        time_t t;
 
        if (outformats & FORMAT_JSON) {
-               printf("\t\"type\": \"crl\",\n");
-               printf("\t\"aki\": \"%s\",\n", pretty_key_id(p->aki));
+               json_do_string("type", "crl");
+               json_do_string("aki", pretty_key_id(p->aki));
        } else
                printf("Authority key identifier: %s\n", pretty_key_id(p->aki));
 
@@ -326,8 +345,8 @@ crl_print(const struct crl *p)
        serial = x509_convert_seqnum(__func__, crlnum);
        if (issuer != NULL && serial != NULL) {
                if (outformats & FORMAT_JSON) {
-                       printf("\t\"crl_issuer\": \"%s\",\n", issuer);
-                       printf("\t\"crl_serial\": \"%s\",\n", serial);
+                       json_do_string("crl_issuer", issuer);
+                       json_do_string("crl_serial", serial);
                } else {
                        printf("CRL issuer:               %s\n", issuer);
                        printf("CRL serial number:        %s\n", serial);
@@ -338,9 +357,9 @@ crl_print(const struct crl *p)
        ASN1_INTEGER_free(crlnum);
 
        if (outformats & FORMAT_JSON) {
-               printf("\t\"valid_since\": %lld,\n", (long long)p->lastupdate);
-               printf("\t\"valid_until\": %lld,\n", (long long)p->nextupdate);
-               printf("\t\"revoked_certs\": [\n");
+               json_do_int("valid_since", p->lastupdate);
+               json_do_int("valid_until", p->nextupdate);
+               json_do_array("revoked_certs");
        } else {
                printf("CRL last update:          %s\n",
                    time2str(p->lastupdate));
@@ -357,11 +376,10 @@ crl_print(const struct crl *p)
                x509_get_time(X509_REVOKED_get0_revocationDate(rev), &t);
                if (serial != NULL) {
                        if (outformats & FORMAT_JSON) {
-                               printf("\t\t{ \"serial\": \"%s\"", serial);
-                               printf(", \"date\": \"%s\" }", time2str(t));
-                               if (i + 1 < sk_X509_REVOKED_num(revlist))
-                                       printf(",");
-                               printf("\n");
+                               json_do_object("cert");
+                               json_do_string("serial", serial);
+                               json_do_string("date", time2str(t));
+                               json_do_end();
                        } else
                                printf("%25s Serial: %8s   Revocation Date: %s"
                                    "\n", "", serial, time2str(t));
@@ -370,7 +388,7 @@ crl_print(const struct crl *p)
        }
 
        if (outformats & FORMAT_JSON)
-               printf("\t],\n");
+               json_do_end();
        else if (i == 0)
                printf("No Revoked Certificates\n");
 }
@@ -382,20 +400,19 @@ mft_print(const X509 *x, const struct mf
        char *hash;
 
        if (outformats & FORMAT_JSON) {
-               printf("\t\"type\": \"manifest\",\n");
-               printf("\t\"ski\": \"%s\",\n", pretty_key_id(p->ski));
+               json_do_string("type", "manifest");
+               json_do_string("ski", pretty_key_id(p->ski));
                x509_print(x);
-               printf("\t\"aki\": \"%s\",\n", pretty_key_id(p->aki));
-               printf("\t\"aia\": \"%s\",\n", p->aia);
-               printf("\t\"sia\": \"%s\",\n", p->sia);
-               printf("\t\"manifest_number\": \"%s\",\n", p->seqnum);
-               if (p->signtime != 0)
-                       printf("\t\"signing_time\": %lld,\n",
-                           (long long)p->signtime);
-               printf("\t\"valid_since\": %lld,\n", (long long)p->thisupdate);
-               printf("\t\"valid_until\": %lld,\n", (long long)p->nextupdate);
+               json_do_string("aki", pretty_key_id(p->aki));
+               json_do_string("aia", p->aia);
+               json_do_string("sia", p->sia);
+               json_do_string("manifest_number", p->seqnum);
+               if (p->signtime != 0)
+                       json_do_int("signing_time", p->signtime);
+               json_do_int("valid_since", p->thisupdate);
+               json_do_int("valid_until", p->nextupdate);
                if (p->expires)
-                       printf("\t\"expires\": %lld,\n", (long long)p->expires);
+                       json_do_int("expires", p->expires);
        } else {
                printf("Subject key identifier:   %s\n", pretty_key_id(p->ski));
                printf("Authority key identifier: %s\n", pretty_key_id(p->aki));
@@ -411,20 +428,18 @@ mft_print(const X509 *x, const struct mf
                printf("Files and hashes:         ");
        }
 
+       if (outformats & FORMAT_JSON)
+               json_do_array("filesandhashes");
        for (i = 0; i < p->filesz; i++) {
-               if (i == 0 && outformats & FORMAT_JSON)
-                       printf("\t\"filesandhashes\": [\n");
-
                if (base64_encode(p->files[i].hash, sizeof(p->files[i].hash),
                    &hash) == -1)
                        errx(1, "base64_encode failure");
 
                if (outformats & FORMAT_JSON) {
-                       printf("\t\t{ \"filename\": \"%s\",", p->files[i].file);
-                       printf(" \"hash\": \"%s\" }", hash);
-                       if (i + 1 < p->filesz)
-                               printf(",");
-                       printf("\n");
+                       json_do_object("filehash");
+                       json_do_string("filename", p->files[i].file);
+                       json_do_string("hash", hash);
+                       json_do_end();
                } else {
                        if (i > 0)
                                printf("%26s", "");
@@ -434,9 +449,8 @@ mft_print(const X509 *x, const struct mf
 
                free(hash);
        }
-
        if (outformats & FORMAT_JSON)
-               printf("\t],\n");
+               json_do_end();
 }
 
 void
@@ -446,19 +460,18 @@ roa_print(const X509 *x, const struct ro
        size_t   i;
 
        if (outformats & FORMAT_JSON) {
-               printf("\t\"type\": \"roa\",\n");
-               printf("\t\"ski\": \"%s\",\n", pretty_key_id(p->ski));
+               json_do_string("type", "roa");
+               json_do_string("ski", pretty_key_id(p->ski));
                x509_print(x);
-               printf("\t\"aki\": \"%s\",\n", pretty_key_id(p->aki));
-               printf("\t\"aia\": \"%s\",\n", p->aia);
-               printf("\t\"sia\": \"%s\",\n", p->sia);
-               if (p->signtime != 0)
-                       printf("\t\"signing_time\": %lld,\n",
-                           (long long)p->signtime);
-               printf("\t\"valid_since\": %lld,\n", (long long)p->notbefore);
-               printf("\t\"valid_until\": %lld,\n", (long long)p->notafter);
+               json_do_string("aki", pretty_key_id(p->aki));
+               json_do_string("aia", p->aia);
+               json_do_string("sia", p->sia);
+               if (p->signtime != 0)
+                       json_do_int("signing_time", p->signtime);
+               json_do_int("valid_since", p->notbefore);
+               json_do_int("valid_until", p->notafter);
                if (p->expires)
-                       printf("\t\"expires\": %lld,\n", (long long)p->expires);
+                       json_do_int("expires", p->expires);
        } else {
                printf("Subject key identifier:   %s\n", pretty_key_id(p->ski));
                x509_print(x);
@@ -475,62 +488,45 @@ roa_print(const X509 *x, const struct ro
                printf("IP address blocks:        ");
        }
 
+       if (outformats & FORMAT_JSON)
+               json_do_array("vrps");
        for (i = 0; i < p->ipsz; i++) {
-               if (i == 0 && outformats & FORMAT_JSON)
-                       printf("\t\"vrps\": [\n");
-
                ip_addr_print(&p->ips[i].addr,
                    p->ips[i].afi, buf, sizeof(buf));
 
                if (outformats & FORMAT_JSON) {
-                       printf("\t\t{ \"prefix\": \"%s\",", buf);
-                       printf(" \"asid\": %u,", p->asid);
-                       printf(" \"maxlen\": %hhu }", p->ips[i].maxlength);
-                       if (i + 1 < p->ipsz)
-                               printf(",");
-                       printf("\n");
+                       json_do_object("vrp");
+                       json_do_string("prefix", buf);
+                       json_do_uint("asid", p->asid);
+                       json_do_uint("maxlen", p->ips[i].maxlength);
+                       json_do_end();
                } else {
                        if (i > 0)
                                printf("%26s", "");
                        printf("%s maxlen: %hhu\n", buf, p->ips[i].maxlength);
                }
        }
-
        if (outformats & FORMAT_JSON)
-               printf("\t],\n");
+               json_do_end();
 }
 
 void
 gbr_print(const X509 *x, const struct gbr *p)
 {
-       size_t  i;
-
        if (outformats & FORMAT_JSON) {
-               printf("\t\"type\": \"gbr\",\n");
-               printf("\t\"ski\": \"%s\",\n", pretty_key_id(p->ski));
+               json_do_string("type", "gbr");
+               json_do_string("ski", pretty_key_id(p->ski));
                x509_print(x);
-               printf("\t\"aki\": \"%s\",\n", pretty_key_id(p->aki));
-               printf("\t\"aia\": \"%s\",\n", p->aia);
-               printf("\t\"sia\": \"%s\",\n", p->sia);
-               if (p->signtime != 0)
-                       printf("\t\"signing_time\": %lld,\n",
-                           (long long)p->signtime);
-               printf("\t\"valid_since\": %lld,\n", (long long)p->notbefore);
-               printf("\t\"valid_until\": %lld,\n", (long long)p->notafter);
+               json_do_string("aki", pretty_key_id(p->aki));
+               json_do_string("aia", p->aia);
+               json_do_string("sia", p->sia);
+               if (p->signtime != 0)
+                       json_do_int("signing_time", p->signtime);
+               json_do_int("valid_since", p->notbefore);
+               json_do_int("valid_until", p->notafter);
                if (p->expires)
-                       printf("\t\"expires\": %lld,\n", (long long)p->expires);
-               printf("\t\"vcard\": \"");
-               for (i = 0; i < strlen(p->vcard); i++) {
-                       if (p->vcard[i] == '"')
-                               printf("\\\"");
-                       if (p->vcard[i] == '\r')
-                               continue;
-                       if (p->vcard[i] == '\n')
-                               printf("\\r\\n");
-                       else
-                               putchar(p->vcard[i]);
-               }
-               printf("\",\n");
+                       json_do_int("expires", p->expires);
+               json_do_string("vcard", p->vcard);
        } else {
                printf("Subject key identifier:   %s\n", pretty_key_id(p->ski));
                x509_print(x);
@@ -550,24 +546,22 @@ gbr_print(const X509 *x, const struct gb
 void
 rsc_print(const X509 *x, const struct rsc *p)
 {
-       char     buf1[64], buf2[64];
        char    *hash;
-       int      sockt;
-       size_t   i, j;
+       size_t   i;
 
        if (outformats & FORMAT_JSON) {
-               printf("\t\"ski\": \"%s\",\n", pretty_key_id(p->ski));
-               printf("\t\"aki\": \"%s\",\n", pretty_key_id(p->aki));
+               json_do_string("type", "rsc");
+               json_do_string("ski", pretty_key_id(p->ski));
                x509_print(x);
-               printf("\t\"aia\": \"%s\",\n", p->aia);
+               json_do_string("aki", pretty_key_id(p->aki));
+               json_do_string("aia", p->aia);
                if (p->signtime != 0)
-                       printf("\t\"signing_time\": %lld,\n",
-                           (long long)p->signtime);
-               printf("\t\"valid_since\": %lld,\n", (long long)p->notbefore);
-               printf("\t\"valid_until\": %lld,\n", (long long)p->notafter);
+                       json_do_int("signing_time", p->signtime);
+               json_do_int("valid_since", p->notbefore);
+               json_do_int("valid_until", p->notafter);
                if (p->expires)
-                       printf("\t\"expires\": %lld,\n", (long long)p->expires);
-               printf("\t\"signed_with_resources\": [\n");
+                       json_do_int("expires", p->expires);
+               json_do_array("signed_with_resources");
        } else {
                printf("Subject key identifier:   %s\n", pretty_key_id(p->ski));
                printf("Authority key identifier: %s\n", pretty_key_id(p->aki));
@@ -582,79 +576,12 @@ rsc_print(const X509 *x, const struct rs
                printf("Signed with resources:    ");
        }
 
-       for (i = 0; i < p->asz; i++) {
-               switch (p->as[i].type) {
-               case CERT_AS_ID:
-                       if (outformats & FORMAT_JSON)
-                               printf("\t\t{ \"asid\": %u }", p->as[i].id);
-                       else {
-                               if (i > 0)
-                                       printf("%26s", "");
-                               printf("AS: %u", p->as[i].id);
-                       }
-                       break;
-               case CERT_AS_RANGE:
-                       if (outformats & FORMAT_JSON)
-                               printf("\t\t{ \"asrange\": { \"min\": %u, "
-                                   "\"max\": %u }}", p->as[i].range.min,
-                                   p->as[i].range.max);
-                       else {
-                               if (i > 0)
-                                       printf("%26s", "");
-                               printf("AS: %u -- %u", p->as[i].range.min,
-                                   p->as[i].range.max);
-                       }
-                       break;
-               case CERT_AS_INHERIT:
-                       /* inheritance isn't possible in RSC */
-                       break;
-               }
-               if (outformats & FORMAT_JSON && i + 1 < p->asz + p->ipsz)
-                       printf(",\n");
-               else
-                       printf("\n");
-       }
-
-       for (j = 0; j < p->ipsz; j++) {
-               switch (p->ips[j].type) {
-               case CERT_IP_ADDR:
-                       ip_addr_print(&p->ips[j].ip,
-                           p->ips[j].afi, buf1, sizeof(buf1));
-                       if (outformats & FORMAT_JSON)
-                               printf("\t\t{ \"ip_prefix\": \"%s\" }", buf1);
-                       else {
-                               if (i > 0 || j > 0)
-                                       printf("%26s", "");
-                               printf("IP: %s", buf1);
-                       }
-                       break;
-               case CERT_IP_RANGE:
-                       sockt = (p->ips[j].afi == AFI_IPV4) ?
-                           AF_INET : AF_INET6;
-                       inet_ntop(sockt, p->ips[j].min, buf1, sizeof(buf1));
-                       inet_ntop(sockt, p->ips[j].max, buf2, sizeof(buf2));
-                       if (outformats & FORMAT_JSON)
-                               printf("\t\t{ \"ip_range\": { \"min\": \"%s\""
-                                   ", \"max\": \"%s\" }}", buf1, buf2);
-                       else {
-                               if (i > 0 || j > 0)
-                                       printf("%26s", "");
-                               printf("IP: %s -- %s", buf1, buf2);
-                       }
-                       break;
-               case CERT_IP_INHERIT:
-                       /* inheritance isn't possible in RSC */
-                       break;
-               }
-               if (outformats & FORMAT_JSON && i + j + 1 < p->asz + p->ipsz)
-                       printf(",\n");
-               else
-                       printf("\n");
-       }
+       as_resources_print(p->as, p->asz);
+       ip_resources_print(p->ips, p->ipsz, p->asz);
 
        if (outformats & FORMAT_JSON) {
-               printf("\t],\n");
-               printf("\t\"filenamesandhashes\": [\n");
+               json_do_end();
+               json_do_array("filenamesandhashes");
        } else
                printf("Filenames and hashes:     ");
 
@@ -664,12 +591,12 @@ rsc_print(const X509 *x, const struct rs
                        errx(1, "base64_encode failure");
 
                if (outformats & FORMAT_JSON) {
-                       printf("\t\t{ \"filename\": \"%s\",",
-                           p->files[i].filename ? p->files[i].filename : "");
-                       printf(" \"hash_digest\": \"%s\" }", hash);
-                       if (i + 1 < p->filesz)
-                               printf(",");
-                       printf("\n");
+                       json_do_object("filehash");
+                       if (p->files[i].filename)
+                               json_do_string("filename",
+                                   p->files[i].filename);
+                       json_do_string("hash_digest", hash);
+                       json_do_end();
                } else {
                        if (i > 0)
                                printf("%26s", "");
@@ -682,75 +609,78 @@ rsc_print(const X509 *x, const struct rs
        }
 
        if (outformats & FORMAT_JSON)
-               printf("\t],\n");
+               json_do_end();
 }
 
 static void
-aspa_implicit_afi(const struct aspa *a)
+aspa_provider(uint32_t as, enum afi afi)
+{
+       if (outformats & FORMAT_JSON) {
+               json_do_object("aspa");
+               json_do_uint("asid", as);
+               if (afi == AFI_IPV4)
+                       json_do_string("afi_limit", "ipv4");
+               if (afi == AFI_IPV6)
+                       json_do_string("afi_limit", "ipv6");
+               json_do_end();
+       } else {
+               printf("AS: %u", as);
+               if (afi == AFI_IPV4)
+                       printf(" (IPv4 only)");
+               if (afi == AFI_IPV6)
+                       printf(" (IPv6 only)");
+               printf("\n");
+       }
+}
+
+static void
+aspa_providers(const struct aspa *a)
 {
        size_t  i;
-       size_t  v4cnt = 0, v6cnt = 0;
+       int     hasv4 = 0, hasv6 = 0;
 
        for (i = 0; i < a->providersz; i++) {
+               if ((outformats & FORMAT_JSON) == 0 && i > 0)
+                       printf("%26s", "");
+               aspa_provider(a->providers[i].as, a->providers[i].afi);
+
                switch (a->providers[i].afi) {
                case AFI_IPV4:
-                       v4cnt++;
+                       hasv4 = 1;
                        break;
                case AFI_IPV6:
-                       v6cnt++;
+                       hasv6 = 1;
                        break;
                default:
-                       return;
+                       hasv4 = hasv6 = 1;
+                       break;
                }
        }
 
-       if (outformats & FORMAT_JSON) {
-               if (a->providersz == v4cnt)
-                       printf("\t\t{ \"asid\": 0, \"afi_limit\": \"ipv6\" 
},\n");
-               if (a->providersz == v6cnt)
-                       printf("\t\t{ \"asid\": 0, \"afi_limit\": \"ipv4\" 
},\n");
-       } else {
-               if (a->providersz == v4cnt)
-                       printf("%25s AS: 0 (IPv6 only)\n", "");
-               if (a->providersz == v6cnt)
-                       printf("%25s AS: 0 (IPv4 only)\n", "");
-       }
+       if (!hasv4)
+               aspa_provider(0, AFI_IPV4);
+       if (!hasv6)
+               aspa_provider(0, AFI_IPV6);
 }
 
 void
 aspa_print(const X509 *x, const struct aspa *p)
 {
-       size_t  i;
-
        if (outformats & FORMAT_JSON) {
-               printf("\t\"type\": \"aspa\",\n");
-               printf("\t\"ski\": \"%s\",\n", pretty_key_id(p->ski));
+               json_do_string("type", "aspa");
+               json_do_string("ski", pretty_key_id(p->ski));
                x509_print(x);
-               printf("\t\"aki\": \"%s\",\n", pretty_key_id(p->aki));
-               printf("\t\"aia\": \"%s\",\n", p->aia);
-               printf("\t\"sia\": \"%s\",\n", p->sia);
-               if (p->signtime != 0)
-                       printf("\t\"signing_time\": %lld,\n",
-                           (long long)p->signtime);
-               printf("\t\"valid_since\": %lld,\n", (long long)p->notbefore);
-               printf("\t\"valid_until\": %lld,\n", (long long)p->notafter);
+               json_do_string("aki", pretty_key_id(p->aki));
+               json_do_string("aia", p->aia);
+               json_do_string("sia", p->sia);
+               if (p->signtime != 0)
+                       json_do_int("signing_time", p->signtime);
+               json_do_int("valid_since", p->notbefore);
+               json_do_int("valid_until", p->notafter);
                if (p->expires)
-                       printf("\t\"expires\": %lld,\n", (long long)p->expires);
-               printf("\t\"customer_asid\": %u,\n", p->custasid);
-               printf("\t\"provider_set\": [\n");
-               aspa_implicit_afi(p);
-               for (i = 0; i < p->providersz; i++) {
-                       printf("\t\t{ \"asid\": %u", p->providers[i].as);
-                       if (p->providers[i].afi == AFI_IPV4)
-                               printf(", \"afi_limit\": \"ipv4\"");
-                       if (p->providers[i].afi == AFI_IPV6)
-                               printf(", \"afi_limit\": \"ipv6\"");
-                       printf(" }");
-                       if (i + 1 < p->providersz)
-                               printf(",");
-                       printf("\n");
-               }
-               printf("\t],\n");
+                       json_do_int("expires", p->expires);
+               json_do_uint("customer_asid", p->custasid);
+               json_do_array("provider_set");
        } else {
                printf("Subject key identifier:   %s\n", pretty_key_id(p->ski));
                x509_print(x);
@@ -765,24 +695,12 @@ aspa_print(const X509 *x, const struct a
                printf("ASPA not after:           %s\n", time2str(p->notafter));
                printf("Customer ASID:            %u\n", p->custasid);
                printf("Provider set:             ");
-               for (i = 0; i < p->providersz; i++) {
-                       if (i > 0)
-                               printf("%26s", "");
-                       printf("AS: %d", p->providers[i].as);
-                       switch (p->providers[i].afi) {
-                       case AFI_IPV4:
-                               printf(" (IPv4 only)");
-                               break;
-                       case AFI_IPV6:
-                               printf(" (IPv6 only)");
-                               break;
-                       default:
-                               break;
-                       }
-                       printf("\n");
-               }
-               aspa_implicit_afi(p);
        }
+
+       aspa_providers(p);
+
+       if (outformats & FORMAT_JSON)
+               json_do_end();
 }
 
 static void
@@ -795,42 +713,30 @@ takey_print(char *name, const struct tak
                errx(1, "base64_encode failed in %s", __func__);
 
        if (outformats & FORMAT_JSON) {
-               printf("\t\t{\n\t\t\t\"name\": \"%s\",\n", name);
-               printf("\t\t\t\"comments\": [");
-               for (i = 0; i < t->commentsz; i++) {
-                       printf("\"%s\"", t->comments[i]);
-                       if (i + 1 < t->commentsz)
-                               printf(", ");
-               }
-               printf("],\n");
-               printf("\t\t\t\"uris\": [");
-               for (i = 0; i < t->urisz; i++) {
-                       printf("\"%s\"", t->uris[i]);
-                       if (i + 1 < t->urisz)
-                               printf(", ");
-               }
-               printf("],\n");
-               printf("\t\t\t\"spki\": \"%s\"\n\t\t}", spki);
+               json_do_object("takey");
+               json_do_string("name", name);
+               json_do_array("comments");
+               for (i = 0; i < t->commentsz; i++)
+                       json_do_string("comment", t->comments[i]);
+               json_do_end();
+               json_do_array("uris");
+               for (i = 0; i < t->urisz; i++)
+                       json_do_string("uri", t->uris[i]);
+               json_do_end();
+               json_do_string("spki", spki);
        } else {
                printf("TAL derived from the '%s' Trust Anchor Key:\n\n", name);
 
-               for (i = 0; i < t->commentsz; i++) {
+               for (i = 0; i < t->commentsz; i++)
                        printf("\t# %s\n", t->comments[i]);
-               }
-
-               for (i = 0; i < t->urisz; i++) {
-                       printf("\t%s\n\n\t", t->uris[i]);
-               }
-
+               printf("\n");
+               for (i = 0; i < t->urisz; i++)
+                       printf("\t%s\n\t", t->uris[i]);
                for (i = 0; i < strlen(spki); i++) {
                        printf("%c", spki[i]);
-                       j++;
-                       if (j == 64) {
+                       if ((++j % 64) == 0)
                                printf("\n\t");
-                               j = 0;
-                       }
                }
-
                printf("\n\n");
        }
 
@@ -841,20 +747,19 @@ void
 tak_print(const X509 *x, const struct tak *p)
 {
        if (outformats & FORMAT_JSON) {
-               printf("\t\"type\": \"tak\",\n");
-               printf("\t\"ski\": \"%s\",\n", pretty_key_id(p->ski));
+               json_do_string("type", "tak");
+               json_do_string("ski", pretty_key_id(p->ski));
                x509_print(x);
-               printf("\t\"aki\": \"%s\",\n", pretty_key_id(p->aki));
-               printf("\t\"aia\": \"%s\",\n", p->aia);
-               printf("\t\"sia\": \"%s\",\n", p->sia);
-               if (p->signtime != 0)
-                       printf("\t\"signing_time\": %lld,\n",
-                           (long long)p->signtime);
-               printf("\t\"valid_since\": %lld,\n", (long long)p->notbefore);
-               printf("\t\"valid_until\": %lld,\n", (long long)p->notafter);
+               json_do_string("aki", pretty_key_id(p->aki));
+               json_do_string("aia", p->aia);
+               json_do_string("sia", p->sia);
+               if (p->signtime != 0)
+                       json_do_int("signing_time", p->signtime);
+               json_do_int("valid_since", p->notbefore);
+               json_do_int("valid_until", p->notafter);
                if (p->expires)
-                       printf("\t\"expires\": %lld,\n", (long long)p->expires);
-               printf("\t\"takeys\": [\n");
+                       json_do_int("expires", p->expires);
+               json_do_array("takeys");
        } else {
                printf("Subject key identifier:   %s\n", pretty_key_id(p->ski));
                x509_print(x);
@@ -870,21 +775,13 @@ tak_print(const X509 *x, const struct ta
        }
 
        takey_print("current", p->current);
-
-       if (p->predecessor != NULL) {
-               if (outformats & FORMAT_JSON)
-                       printf(",\n");
+       if (p->predecessor != NULL)
                takey_print("predecessor", p->predecessor);
-       }
-
-       if (p->successor != NULL) {
-               if (outformats & FORMAT_JSON)
-                       printf(",\n");
+       if (p->successor != NULL)
                takey_print("successor", p->successor);
-       }
 
        if (outformats & FORMAT_JSON)
-               printf("\n\t],\n");
+               json_do_end();
 }
 
 void
@@ -894,17 +791,18 @@ geofeed_print(const X509 *x, const struc
        size_t   i;
 
        if (outformats & FORMAT_JSON) {
-               printf("\t\"type\": \"geofeed\",\n");
-               printf("\t\"ski\": \"%s\",\n", pretty_key_id(p->ski));
+               json_do_string("type", "geofeed");
+               json_do_string("ski", pretty_key_id(p->ski));
                x509_print(x);
-               printf("\t\"aki\": \"%s\",\n", pretty_key_id(p->aki));
-               printf("\t\"aia\": \"%s\",\n", p->aia);
+               json_do_string("aki", pretty_key_id(p->aki));
+               json_do_string("aia", p->aia);
                if (p->signtime != 0)
-                       printf("\t\"signing_time\": %lld,\n",
-                           (long long)p->signtime);
-               printf("\t\"valid_since\": %lld,\n", (long long)p->notbefore);
-               printf("\t\"valid_until\": %lld,\n", (long long)p->notafter);
-               printf("\t\"records\": [\n");
+                       json_do_int("signing_time", p->signtime);
+               json_do_int("valid_since", p->notbefore);
+               json_do_int("valid_until", p->notafter);
+               if (p->expires)
+                       json_do_int("expires", p->expires);
+               json_do_array("records");
        } else {
                printf("Subject key identifier:   %s\n", pretty_key_id(p->ski));
                x509_print(x);
@@ -925,21 +823,18 @@ geofeed_print(const X509 *x, const struc
 
                ip_addr_print(&p->geoips[i].ip->ip, p->geoips[i].ip->afi, buf,
                    sizeof(buf));
-               if (outformats & FORMAT_JSON)
-                       printf("\t\t{ \"prefix\": \"%s\", \"location\": \"%s\""
-                           "}", buf, p->geoips[i].loc);
-               else {
+               if (outformats & FORMAT_JSON) {
+                       json_do_object("geoip");
+                       json_do_string("prefix", buf);
+                       json_do_string("location", p->geoips[i].loc);
+                       json_do_end();
+               } else {
                        if (i > 0)
                                printf("%26s", "");
-                       printf("IP: %s (%s)", buf, p->geoips[i].loc);
+                       printf("IP: %s (%s)\n", buf, p->geoips[i].loc);
                }
-
-               if (outformats & FORMAT_JSON && i + 1 < p->geoipsz)
-                       printf(",\n");
-               else
-                       printf("\n");
        }
 
        if (outformats & FORMAT_JSON)
-               printf("\t],\n");
+               json_do_end();
 }

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