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-rw-r--r--src/user/lib/string.c46
1 files changed, 43 insertions, 3 deletions
diff --git a/src/user/lib/string.c b/src/user/lib/string.c
index 386cffa..fa9c0ca 100644
--- a/src/user/lib/string.c
+++ b/src/user/lib/string.c
@@ -1,6 +1,7 @@
#include <ctype.h>
#include <errno.h>
#include <string.h>
+#include <strings.h>
long strtol(const char *restrict s, char **restrict end, int base) {
long res = 0;
@@ -55,7 +56,14 @@ double strtod(const char *restrict s, char **restrict end) {
char *strchr(const char *s, int c) {
for (; *s; s++) {
- if (*s == c) return (char*)s;
+ if (*s == c) return (char *)s;
+ }
+ return NULL;
+}
+
+char *strrchr(const char *s, int c) {
+ for (int i = strlen(s) + 1; i >= 0; i--) {
+ if (s[i] == c) return (char *)s + i;
}
return NULL;
}
@@ -123,9 +131,24 @@ char *strstr(const char *s1, const char *s2) {
}
char *strcpy(char *restrict s1, const char *restrict s2) {
- char *ret = s1;
while (*s2) *s1++ = *s2++;
- return ret;
+ *s1 = *s2;
+ return s1;
+}
+
+char *strncpy(char *restrict s1, const char *restrict s2, size_t n) {
+ for (size_t i = 0; i < n; i++) {
+ s1[i] = s2[i];
+ if (s1[i] == '\0') return s1 + i; // TODO fill with null bytes
+ }
+ return s1 + n;
+}
+
+char *strdup(const char *s) {
+ size_t len = strlen(s) + 1;
+ char *buf = malloc(len);
+ if (buf) memcpy(buf, s, len);
+ return buf;
}
// TODO strerror mapping
@@ -133,3 +156,20 @@ char *strerror(int errnum) {
(void)errnum;
return "unknown error";
}
+
+/* strings.h */
+int strcasecmp(const char *s1, const char *s2) {
+ return strncasecmp(s1, s2, ~0);
+}
+
+int strncasecmp(const char *s1, const char *s2, size_t n) {
+ for (size_t i = 0; i < n; i++) {
+ char c1 = tolower(s1[i]), c2 = tolower(s2[i]);
+ if (c1 == '\0' || c1 != c2) {
+ if (c1 < c2) return -1;
+ else if (c1 > c2) return 1;
+ else return 0;
+ }
+ }
+ return 0;
+}