Andrew's git - gitweb.git/blob

   1#include "../git-compat-util.h"
   2
   3/*
   4 * The size parameter specifies the available space, i.e. includes
   5 * the trailing NUL byte; but Windows's vsnprintf expects the
   6 * number of characters to write without the trailing NUL.
   7 */
   8#ifndef SNPRINTF_SIZE_CORR
   9#define SNPRINTF_SIZE_CORR 0
  10#endif
  11
  12#undef vsnprintf
  13int git_vsnprintf(char *str, size_t maxsize, const char *format, va_list ap)
  14{
  15        char *s;
  16        int ret = -1;
  17
  18        if (maxsize > 0) {
  19                ret = vsnprintf(str, maxsize-SNPRINTF_SIZE_CORR, format, ap);
  20                if (ret == maxsize-1)
  21                        ret = -1;
  22                /* Windows does not NUL-terminate if result fills buffer */
  23                str[maxsize-1] = 0;
  24        }
  25        if (ret != -1)
  26                return ret;
  27
  28        s = NULL;
  29        if (maxsize < 128)
  30                maxsize = 128;
  31
  32        while (ret == -1) {
  33                maxsize *= 4;
  34                str = realloc(s, maxsize);
  35                if (! str)
  36                        break;
  37                s = str;
  38                ret = vsnprintf(str, maxsize-SNPRINTF_SIZE_CORR, format, ap);
  39                if (ret == maxsize-1)
  40                        ret = -1;
  41        }
  42        free(s);
  43        return ret;
  44}
  45
  46int git_snprintf(char *str, size_t maxsize, const char *format, ...)
  47{
  48        va_list ap;
  49        int ret;
  50
  51        va_start(ap, format);
  52        ret = git_vsnprintf(str, maxsize, format, ap);
  53        va_end(ap);
  54
  55        return ret;
  56}
  57