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git/compat/snprintf.c
Michal Rokos c4582f93a2 Add compat/snprintf.c for systems that return bogus
Some systems (namely HPUX and Windows) return -1 when maxsize in snprintf()
and in vsnprintf() is reached. So replace snprintf() and vsnprintf()
functions with our own ones that return correct value upon overflow.

[jc: verified that review comments by J6t have been incorporated, and
 tightened the check to verify the resulting buffer contents, suggested
 by Wayne Davison]

Signed-off-by: Michal Rokos <michal.rokos@nextsoft.cz>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-03-05 13:12:07 -08:00

40 lines
644 B
C

#include "../git-compat-util.h"
#undef vsnprintf
int git_vsnprintf(char *str, size_t maxsize, const char *format, va_list ap)
{
char *s;
int ret;
ret = vsnprintf(str, maxsize, format, ap);
if (ret != -1)
return ret;
s = NULL;
if (maxsize < 128)
maxsize = 128;
while (ret == -1) {
maxsize *= 4;
str = realloc(s, maxsize);
if (! str)
break;
s = str;
ret = vsnprintf(str, maxsize, format, ap);
}
free(s);
return ret;
}
int git_snprintf(char *str, size_t maxsize, const char *format, ...)
{
va_list ap;
int ret;
va_start(ap, format);
ret = git_vsnprintf(str, maxsize, format, ap);
va_end(ap);
return ret;
}