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libc: Implement strrchr()

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apio 2022-10-15 15:16:19 +02:00
parent f13c48b562
commit 6953a28ce8
2 changed files with 11 additions and 0 deletions
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3
libs/libc/include/string.h
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@ -43,6 +43,9 @@ extern "C"
/* Returns a pointer to the first occurrence of the character c in str, or NULL if it is not found. */ /* Returns a pointer to the first occurrence of the character c in str, or NULL if it is not found. */
char* strchr(const char* str, int c); char* strchr(const char* str, int c);
/* Returns a pointer to the last occurrence of the character c in str, or NULL if it is not found. */
char* strrchr(const char* str, int c);
/* Concatenates the string src into dest. This function is unsafe, use strncat instead. */ /* Concatenates the string src into dest. This function is unsafe, use strncat instead. */
__lc_deprecated("strcat is unsafe and should not be used; use strncat instead") char* strcat(char* dest, __lc_deprecated("strcat is unsafe and should not be used; use strncat instead") char* strcat(char* dest,
const char* src); const char* src);

8
libs/libc/src/string.cpp
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@ -133,6 +133,14 @@ extern "C"
return NULL; return NULL;
} }
char* strrchr(const char* str, int c)
{
const char* s = str + strlen(str);
while (s != str && *str != (char)c) str--;
if (s != str) return const_cast<char*>(s);
return NULL;
}
void* bzero(void* buf, size_t n) void* bzero(void* buf, size_t n)
{ {
return memset(buf, 0, n); return memset(buf, 0, n);