[PATCH v6 0/2] Replace atoi() with strtoi_with_tail()

Hello,

This patch series replaces atoi() with an updated version of strtol_i() called strtoi_with_tail (Credits: Junio C Hamano). The reasoning behind this is to improve error handling by not allowing non-numerical characters in the hunk header (which might happen in case of a corrupt patch, although rarely).

There is still a change to be made, as Junio says: "A corrupt patch may be getting a nonsense patch-ID with the current code and hopefully is not matching other patches that are not corrupt, but with such a change, a corrupt patch may not be getting any patch-ID and a loop that computes patch-ID for many files and try to match them up might need to be rewritten to take the new failure case into account." I'm not sure where this change needs to me made (maybe get_one_patchid()?). It would be great if anyone could point me to the correct place.

Thanks, Mohit Marathe

Mohit Marathe (2):
  git-compat-util: add strtoi_with_tail()
  patch-id: replace `atoi()` with `strtoi_with_tail`

 builtin/patch-id.c | 12 ++++++++----
 git-compat-util.h  | 18 ++++++++++++++----
 2 files changed, 22 insertions(+), 8 deletions(-)

base-commit: 2a540e432fe5dff3cfa9d3bf7ca56db2ad12ebb9
Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-1646%2Fmohit-marathe%2Fupdate-strtol_i-v6
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-1646/mohit-marathe/update-strtol_i-v6
Pull-Request: https://github.com/gitgitgadget/git/pull/1646

Range-diff vs v5:

 1:  f09b0838f04 ! 1:  98e516a7be7 git-compat-util: add strtoi_with_tail()
     @@ Commit message
          Signed-off-by: Mohit Marathe <mohitmarathe@proton.me>
      
       ## git-compat-util.h ##
     -@@ git-compat-util.h: static inline int strtol_i(char const *s, int base, int *result)
     +@@ git-compat-util.h: static inline int strtoul_ui(char const *s, int base, unsigned int *result)
       	return 0;
       }
       
     +-static inline int strtol_i(char const *s, int base, int *result)
      +#define strtol_i(s,b,r) strtoi_with_tail((s), (b), (r), NULL)
      +static inline int strtoi_with_tail(char const *s, int base, int *result, char **endp)
     -+{
     -+	long ul;
     + {
     + 	long ul;
     +-	char *p;
      +	char *dummy = NULL;
     -+
     + 
      +	if (!endp)
      +		endp = &dummy;
     -+	errno = 0;
     + 	errno = 0;
     +-	ul = strtol(s, &p, base);
     +-	if (errno || *p || p == s || (int) ul != ul)
      +	ul = strtol(s, endp, base);
      +	if (errno ||
      +	    /*
     @@ git-compat-util.h: static inline int strtol_i(char const *s, int base, int *resu
      +	     */
      +	   (dummy && *dummy) ||
      +	    *endp == s || (int) ul != ul)
     -+		return -1;
     -+	*result = ul;
     -+	return 0;
     -+}
     -+
     - void git_stable_qsort(void *base, size_t nmemb, size_t size,
     - 		      int(*compar)(const void *, const void *));
     - #ifdef INTERNAL_QSORT
     + 		return -1;
     + 	*result = ul;
     + 	return 0;
 2:  ee8f4ae991d = 2:  858d6f94e79 patch-id: replace `atoi()` with `strtoi_with_tail`