[PATCH v4 07/13] utf8.c: add reencode_string_len() that can handle NULs in string

[Nguyễn Thái Ngọc Duy]

Signed-off-by: Nguyễn Thái Ngọc Duy <pclo...@gmail.com>
---
 compat/precompose_utf8.c |  2 +-
 utf8.c                   | 10 +++++++---
 utf8.h                   | 19 ++++++++++++++++---
 3 files changed, 24 insertions(+), 7 deletions(-)

diff --git a/compat/precompose_utf8.c b/compat/precompose_utf8.c
index 8cf5955..d9203d0 100644
--- a/compat/precompose_utf8.c
+++ b/compat/precompose_utf8.c
@@ -78,7 +78,7 @@ void precompose_argv(int argc, const char **argv)
                size_t namelen;
                oldarg = argv[i];
                if (has_non_ascii(oldarg, (size_t)-1, &namelen)) {
-                       newarg = reencode_string_iconv(oldarg, namelen, 
ic_precompose);
+                       newarg = reencode_string_iconv(oldarg, namelen, 
ic_precompose, NULL);
                        if (newarg)
                                argv[i] = newarg;
                }
diff --git a/utf8.c b/utf8.c
index e7ba33c..7c342ff 100644
--- a/utf8.c
+++ b/utf8.c
@@ -468,7 +468,7 @@ int utf8_fprintf(FILE *stream, const char *format, ...)
 #else
        typedef char * iconv_ibp;
 #endif
-char *reencode_string_iconv(const char *in, size_t insz, iconv_t conv)
+char *reencode_string_iconv(const char *in, size_t insz, iconv_t conv, int 
*outsz_p)
 {
        size_t outsz, outalloc;
        char *out, *outpos;
@@ -502,13 +502,17 @@ char *reencode_string_iconv(const char *in, size_t insz, 
iconv_t conv)
                }
                else {
                        *outpos = '\0';
+                       if (outsz_p)
+                               *outsz_p = outpos - out;
                        break;
                }
        }
        return out;
 }
 
-char *reencode_string(const char *in, const char *out_encoding, const char 
*in_encoding)
+char *reencode_string_len(const char *in, int insz,
+                         const char *out_encoding, const char *in_encoding,
+                         int *outsz)
 {
        iconv_t conv;
        char *out;
@@ -534,7 +538,7 @@ char *reencode_string(const char *in, const char 
*out_encoding, const char *in_e
                        return NULL;
        }
 
-       out = reencode_string_iconv(in, strlen(in), conv);
+       out = reencode_string_iconv(in, insz, conv, outsz);
        iconv_close(conv);
        return out;
 }
diff --git a/utf8.h b/utf8.h
index d3da96f..a43ef9a 100644
--- a/utf8.h
+++ b/utf8.h
@@ -17,12 +17,25 @@ void strbuf_add_wrapped_bytes(struct strbuf *buf, const 
char *data, int len,
                             int indent, int indent2, int width);
 
 #ifndef NO_ICONV
-char *reencode_string_iconv(const char *in, size_t insz, iconv_t conv);
-char *reencode_string(const char *in, const char *out_encoding, const char 
*in_encoding);
+char *reencode_string_iconv(const char *in, size_t insz,
+                           iconv_t conv, int *outsz);
+char *reencode_string_len(const char *in, int insz,
+                         const char *out_encoding,
+                         const char *in_encoding,
+                         int *outsz);
 #else
-#define reencode_string(a,b,c) NULL
+#define reencode_string_len(a,b,c,d,e) NULL
 #endif
 
+static inline char *reencode_string(const char *in,
+                                   const char *out_encoding,
+                                   const char *in_encoding)
+{
+       return reencode_string_len(in, strlen(in),
+                                  out_encoding, in_encoding,
+                                  NULL);
+}
+
 int mbs_chrlen(const char **text, size_t *remainder_p, const char *encoding);
 
 #endif
-- 
1.8.2.82.gc24b958

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