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| author | Jeff Hostetler <jeffhost@microsoft.com> | 2017-04-14 19:12:28 +0000 |
|---|---|---|
| committer | Junio C Hamano <gitster@pobox.com> | 2017-04-15 02:21:12 -0700 |
| commit | a6db3fbb6e4ec11695e2a3af8bc2cb9119cb1941 (patch) | |
| tree | 6eeb1de45587403bee39e7579585c57409d1346c /read-cache.c | |
| parent | cf11a67975b057a144618badf16dc4e3d25b9407 (diff) | |
| download | git-a6db3fbb6e4ec11695e2a3af8bc2cb9119cb1941.tar.gz | |
read-cache: add strcmp_offset function
Add strcmp_offset() function to also return the offset of the
first change.
Add unit test and helper to verify.
Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'read-cache.c')
| -rw-r--r-- | read-cache.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/read-cache.c b/read-cache.c index e447751823..11823f5dbc 100644 --- a/read-cache.c +++ b/read-cache.c @@ -887,6 +887,26 @@ static int has_file_name(struct index_state *istate, return retval; } + +/* + * Like strcmp(), but also return the offset of the first change. + * If strings are equal, return the length. + */ +int strcmp_offset(const char *s1, const char *s2, size_t *first_change) +{ + size_t k; + + if (!first_change) + return strcmp(s1, s2); + + for (k = 0; s1[k] == s2[k]; k++) + if (s1[k] == '\0') + break; + + *first_change = k; + return (unsigned char)s1[k] - (unsigned char)s2[k]; +} + /* * Do we have another file with a pathname that is a proper * subset of the name we're trying to add? |