diff options
Diffstat (limited to 'libiberty/filename_cmp.c')
-rw-r--r-- | libiberty/filename_cmp.c | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/libiberty/filename_cmp.c b/libiberty/filename_cmp.c index 0a4d0d8509..0eed12086b 100644 --- a/libiberty/filename_cmp.c +++ b/libiberty/filename_cmp.c @@ -76,3 +76,52 @@ filename_cmp (const char *s1, const char *s2) #endif } +/* + +@deftypefn Extension int filename_ncmp (const char *@var{s1}, const char *@var{s2}, size_t @var{n}) + +Return zero if the two file names @var{s1} and @var{s2} are equivalent +in range @var{n}. +If not equivalent, the returned value is similar to what @code{strncmp} +would return. In other words, it returns a negative value if @var{s1} +is less than @var{s2}, or a positive value if @var{s2} is greater than +@var{s2}. + +This function does not normalize file names. As a result, this function +will treat filenames that are spelled differently as different even in +the case when the two filenames point to the same underlying file. +However, it does handle the fact that on DOS-like file systems, forward +and backward slashes are equal. + +@end deftypefn + +*/ + +int +filename_ncmp (const char *s1, const char *s2, size_t n) +{ +#ifndef HAVE_DOS_BASED_FILE_SYSTEM + return strncmp(s1, s2, n); +#else + if (!n) + return 0; + for (; n > 0; --n) + { + int c1 = TOLOWER (*s1); + int c2 = TOLOWER (*s2); + + /* On DOS-based file systems, the '/' and the '\' are equivalent. */ + if (c1 == '/') + c1 = '\\'; + if (c2 == '/') + c2 = '\\'; + + if (c1 == '\0' || c1 != c2) + return (c1 - c2); + + s1++; + s2++; + } + return 0; +#endif +} |