diff options
Diffstat (limited to 'stm')
| -rw-r--r-- | stm/std.h | 2 | ||||
| -rw-r--r-- | stm/string0.c | 28 |
2 files changed, 30 insertions, 0 deletions
@@ -17,6 +17,8 @@ int strncmp(const char *s1, const char *s2, size_t n); char *strndup(const char *s, size_t n); char *strcpy(char *dest, const char *src); char *strcat(char *dest, const char *src); +char *strchr(const char *s, int c); +char *strstr(const char *haystack, const char *needle); int printf(const char *fmt, ...); int snprintf(char *str, size_t size, const char *fmt, ...); diff --git a/stm/string0.c b/stm/string0.c index 2a5f255971..d67c5f2b17 100644 --- a/stm/string0.c +++ b/stm/string0.c @@ -108,3 +108,31 @@ char *strcat(char *dest, const char *src) { *d = '\0'; return dest; } + +// Public Domain implementation of strchr from: +// http://en.wikibooks.org/wiki/C_Programming/Strings#The_strchr_function +char *strchr(const char *s, int c) +{ + /* Scan s for the character. When this loop is finished, + s will either point to the end of the string or the + character we were looking for. */ + while (*s != '\0' && *s != (char)c) + s++; + return ((*s == c) ? (char *) s : 0); +} + + +// Public Domain implementation of strstr from: +// http://en.wikibooks.org/wiki/C_Programming/Strings#The_strstr_function +char *strstr(const char *haystack, const char *needle) +{ + size_t needlelen; + /* Check for the null needle case. */ + if (*needle == '\0') + return (char *) haystack; + needlelen = strlen(needle); + for (; (haystack = strchr(haystack, *needle)) != 0; haystack++) + if (strncmp(haystack, needle, needlelen) == 0) + return (char *) haystack; + return 0; +} |