On Thu, Sep 08, 2016 at 09:31:11AM +0200, Johannes Schindelin wrote:
> diff --git a/git-compat-util.h b/git-compat-util.h
> index db89ba7..19128b3 100644
> --- a/git-compat-util.h
> +++ b/git-compat-util.h
> @@ -965,6 +965,27 @@ void git_qsort(void *base, size_t nmemb, size_t size,
> #define qsort git_qsort
> #endif
>
> +static inline int regexec_buf(const regex_t *preg, const char *buf, size_t size,
> + size_t nmatch, regmatch_t pmatch[], int eflags)
> +{
> +#ifdef REG_STARTEND
> + assert(nmatch > 0 && pmatch);
> + pmatch[0].rm_so = 0;
> + pmatch[0].rm_eo = size;
> + return regexec(preg, buf, nmatch, pmatch, eflags | REG_STARTEND);
> +#else
> + char *buf2 = xmalloc(size + 1);
> + int ret;
> +
> + memcpy(buf2, buf, size);
> + buf2[size] = '\0';
I mentioned elsewhere that I'd prefer we just push people into using
compat/regex if they don't have REG_STARTEND. But if we _do_ keep this
fallback, note that the above has a buffer overflow (think what happens
when "size" is the maximum value for a size_t). You can avoid it by
using xmallocz().
-Peff