It's a common pattern to do:
foo = xmalloc(strlen(one) + strlen(two) + 1 + 1);
sprintf(foo, "%s %s", one, two);
(or possibly some variant with strcpy()s or a more
complicated length computation). We can switch these to use
xstrfmt, which is shorter, involves less error-prone manual
computation, and removes many sprintf and strcpy calls which
make it harder to audit the code for real buffer overflows.
Signed-off-by: Jeff King <p...@peff.net>
---
builtin/apply.c | 5 +----
builtin/ls-remote.c | 8 ++------
builtin/name-rev.c | 13 +++++--------
environment.c | 7 ++-----
imap-send.c | 5 ++---
reflog-walk.c | 7 +++----
remote.c | 7 +------
setup.c | 12 +++---------
unpack-trees.c | 4 +---
9 files changed, 20 insertions(+), 48 deletions(-)
diff --git a/builtin/apply.c b/builtin/apply.c
index 4aa53f7..094a20f 100644
--- a/builtin/apply.c
+++ b/builtin/apply.c
@@ -698,10 +698,7 @@ static char *find_name_common(const char *line, const char
*def,
}
if (root) {
- char *ret = xmalloc(root_len + len + 1);
- strcpy(ret, root);
- memcpy(ret + root_len, start, len);
- ret[root_len + len] = '\0';
+ char *ret = xstrfmt("%s%.*s", root, len, start);
return squash_slash(ret);
}
diff --git a/builtin/ls-remote.c b/builtin/ls-remote.c
index 4554dbc..5b6d679 100644
--- a/builtin/ls-remote.c
+++ b/builtin/ls-remote.c
@@ -93,12 +93,8 @@ int cmd_ls_remote(int argc, const char **argv, const char
*prefix)
if (argv[i]) {
int j;
pattern = xcalloc(argc - i + 1, sizeof(const char *));
- for (j = i; j < argc; j++) {
- int len = strlen(argv[j]);
- char *p = xmalloc(len + 3);
- sprintf(p, "*/%s", argv[j]);
- pattern[j - i] = p;
- }
+ for (j = i; j < argc; j++)
+ pattern[j - i] = xstrfmt("*/%s", argv[j]);
}
remote = remote_get(dest);
if (!remote) {
diff --git a/builtin/name-rev.c b/builtin/name-rev.c
index 248a3eb..8a3a0cd 100644
--- a/builtin/name-rev.c
+++ b/builtin/name-rev.c
@@ -56,19 +56,16 @@ copy_data:
parents = parents->next, parent_number++) {
if (parent_number > 1) {
int len = strlen(tip_name);
- char *new_name = xmalloc(len +
- 1 + decimal_length(generation) + /* ~<n> */
- 1 + 2 + /* ^NN */
- 1);
+ char *new_name;
if (len > 2 && !strcmp(tip_name + len - 2, "^0"))
len -= 2;
if (generation > 0)
- sprintf(new_name, "%.*s~%d^%d", len, tip_name,
- generation, parent_number);
+ new_name = xstrfmt("%.*s~%d^%d", len, tip_name,
+ generation, parent_number);
else
- sprintf(new_name, "%.*s^%d", len, tip_name,
- parent_number);
+ new_name = xstrfmt("%.*s^%d", len, tip_name,
+ parent_number);
name_rev(parents->item, new_name, 0,
distance + MERGE_TRAVERSAL_WEIGHT, 0);
diff --git a/environment.c b/environment.c
index a533aed..c5b65f5 100644
--- a/environment.c
+++ b/environment.c
@@ -143,11 +143,8 @@ static char *git_path_from_env(const char *envvar, const
char *git_dir,
const char *path, int *fromenv)
{
const char *value = getenv(envvar);
- if (!value) {
- char *buf = xmalloc(strlen(git_dir) + strlen(path) + 2);
- sprintf(buf, "%s/%s", git_dir, path);
- return buf;
- }
+ if (!value)
+ return xstrfmt("%s/%s", git_dir, path);
if (fromenv)
*fromenv = 1;
return xstrdup(value);
diff --git a/imap-send.c b/imap-send.c
index 37ac4aa..01aa227 100644
--- a/imap-send.c
+++ b/imap-send.c
@@ -889,9 +889,8 @@ static char *cram(const char *challenge_64, const char
*user, const char *pass)
}
/* response: "<user> <digest in hex>" */
- resp_len = strlen(user) + 1 + strlen(hex) + 1;
- response = xmalloc(resp_len);
- sprintf(response, "%s %s", user, hex);
+ response = xstrfmt("%s %s", user, hex);
+ resp_len = strlen(response);
response_64 = xmalloc(ENCODED_SIZE(resp_len) + 1);
encoded_len = EVP_EncodeBlock((unsigned char *)response_64,
diff --git a/reflog-walk.c b/reflog-walk.c
index f8e743a..85b8a54 100644
--- a/reflog-walk.c
+++ b/reflog-walk.c
@@ -56,12 +56,11 @@ static struct complete_reflogs *read_complete_reflog(const
char *ref)
}
}
if (reflogs->nr == 0) {
- int len = strlen(ref);
- char *refname = xmalloc(len + 12);
- sprintf(refname, "refs/%s", ref);
+ char *refname = xstrfmt("refs/%s", ref);
for_each_reflog_ent(refname, read_one_reflog, reflogs);
if (reflogs->nr == 0) {
- sprintf(refname, "refs/heads/%s", ref);
+ free(refname);
+ refname = xstrfmt("refs/heads/%s", ref);
for_each_reflog_ent(refname, read_one_reflog, reflogs);
}
free(refname);
diff --git a/remote.c b/remote.c
index 26504b7..5ab0f7f 100644
--- a/remote.c
+++ b/remote.c
@@ -65,7 +65,6 @@ static int valid_remote(const struct remote *remote)
static const char *alias_url(const char *url, struct rewrites *r)
{
int i, j;
- char *ret;
struct counted_string *longest;
int longest_i;
@@ -86,11 +85,7 @@ static const char *alias_url(const char *url, struct
rewrites *r)
if (!longest)
return url;
- ret = xmalloc(r->rewrite[longest_i]->baselen +
- (strlen(url) - longest->len) + 1);
- strcpy(ret, r->rewrite[longest_i]->base);
- strcpy(ret + r->rewrite[longest_i]->baselen, url + longest->len);
- return ret;
+ return xstrfmt("%s%s", r->rewrite[longest_i]->base, url + longest->len);
}
static void add_push_refspec(struct remote *remote, const char *ref)
diff --git a/setup.c b/setup.c
index a17c51e..2b64cbb 100644
--- a/setup.c
+++ b/setup.c
@@ -99,10 +99,7 @@ char *prefix_path_gently(const char *prefix, int len,
return NULL;
}
} else {
- sanitized = xmalloc(len + strlen(path) + 1);
- if (len)
- memcpy(sanitized, prefix, len);
- strcpy(sanitized + len, path);
+ sanitized = xstrfmt("%.*s%s", len, prefix, path);
if (remaining_prefix)
*remaining_prefix = len;
if (normalize_path_copy_len(sanitized, sanitized,
remaining_prefix)) {
@@ -468,11 +465,8 @@ const char *read_gitfile_gently(const char *path, int
*return_error_code)
if (!is_absolute_path(dir) && (slash = strrchr(path, '/'))) {
size_t pathlen = slash+1 - path;
- size_t dirlen = pathlen + len - 8;
- dir = xmalloc(dirlen + 1);
- strncpy(dir, path, pathlen);
- strncpy(dir + pathlen, buf + 8, len - 8);
- dir[dirlen] = '\0';
+ dir = xstrfmt("%.*s%.*s", (int)pathlen, path,
+ (int)(len - 8), buf + 8);
free(buf);
buf = dir;
}
diff --git a/unpack-trees.c b/unpack-trees.c
index f932e80..8e2032f 100644
--- a/unpack-trees.c
+++ b/unpack-trees.c
@@ -1350,9 +1350,7 @@ static int verify_clean_subdirectory(const struct
cache_entry *ce,
* Then we need to make sure that we do not lose a locally
* present file that is not ignored.
*/
- pathbuf = xmalloc(namelen + 2);
- memcpy(pathbuf, ce->name, namelen);
- strcpy(pathbuf+namelen, "/");
+ pathbuf = xstrfmt("%.*s/", namelen, ce->name);
memset(&d, 0, sizeof(d));
if (o->dir)
--
2.6.0.rc2.408.ga2926b9
--
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