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librb: rb_snprinf_append: handle error return value from vsnprintf()

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Simon Arlott 2017-07-30 17:03:30 +01:00
parent 2cc7be9977
commit 8573c3409e
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GPG key ID: C8975F2043CA5D24
1 changed files with 9 additions and 6 deletions
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15
librb/src/tools.c
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@ -303,22 +303,25 @@ int
rb_snprintf_append(char *str, size_t len, const char *format, ...)
{
if(len == 0)
return 0;
return -1;
size_t x = strlen(str);
int orig_len = strlen(str);
if(len < x)
if((int)len < orig_len)
{
str[len - 1] = '\0';
return (int)len - 1;
return len - 1;
}
va_list ap;
va_start(ap, format);
int y = (vsnprintf(str + x, len - x, format, ap) + (int)x);
int append_len = vsnprintf(str + orig_len, len - orig_len, format, ap);
va_end(ap);
return (y);
if (append_len < 0)
return append_len;
return (orig_len + append_len);
}
/* rb_basename