diff options
| author | Anton Kling <anton@kling.gg> | 2023-10-22 19:50:38 +0200 |
|---|---|---|
| committer | Anton Kling <anton@kling.gg> | 2023-10-22 19:50:38 +0200 |
| commit | 4e09bca9e34c226b6d7e34b4fa11248405fd988e (patch) | |
| tree | 80f156b7940d9d19971395f335530170c69516c7 /userland/libc/string/strcmp.c | |
Move everything into a new repo.
Diffstat (limited to 'userland/libc/string/strcmp.c')
| -rw-r--r-- | userland/libc/string/strcmp.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/userland/libc/string/strcmp.c b/userland/libc/string/strcmp.c new file mode 100644 index 0000000..368b8fb --- /dev/null +++ b/userland/libc/string/strcmp.c @@ -0,0 +1,29 @@ +#include <string.h> + +// https://pubs.opengroup.org/onlinepubs/9699919799/ +int strcmp(const char *s1, const char *s2) { + // The strcmp() function shall compare the string pointed to by s1 + // to the string pointed to by s2. + int l1, l2, rc; + l1 = l2 = rc = 0; + for (; *s1 || *s2;) { + if (*s1 != *s2) + rc++; + if (*s1) { + l1++; + s1++; + } + if (*s2) { + l2++; + s2++; + } + } + + // Upon completion, strcmp() shall return an integer greater than, + // equal to, or less than 0, if the string pointed to by s1 is + // greater than, equal to, or less than the string pointed to by + // s2, respectively. + if (l2 > l1) + return -rc; + return rc; +} |