130 lines
1.5 KiB
C
130 lines
1.5 KiB
C
/*++
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Copyright (c) 2024, Quinn Stephens.
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Provided under the BSD 3-Clause license.
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Module Name:
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str.c
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Abstract:
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Provides string manipulation routines.
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--*/
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#include <string.h>
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size_t
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strlen (
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const char *str
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)
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{
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const char *ptr;
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ptr = str;
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while (*ptr++);
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return ptr - str - sizeof(char);
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}
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size_t
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strnlen (
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const char *str,
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size_t maxlen
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)
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{
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size_t len;
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len = 0;
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while (len < maxlen && str[len++]);
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return len - sizeof(char);
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}
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int
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strcmp (
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const char* s1,
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const char* s2
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)
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{
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while (*s1 == *s2) {
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if (*s1 == '\0') {
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return 0;
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}
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s1++;
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s2++;
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}
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return *(unsigned char *)s1 - *(unsigned char*)s2;
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}
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int
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strncmp (
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const char* s1,
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const char* s2,
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size_t n
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)
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{
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while (n > 0) {
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if (*s1 != *s2) {
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return *(unsigned char *)s1 - *(unsigned char*)s2;
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}
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if (*s1 == '\0') {
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return 0;
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}
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n--;
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s1++;
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s2++;
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}
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return 0;
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}
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char *
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strchr (
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const char *s,
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int c
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)
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{
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while (*s != (char)c) {
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if (!*s) {
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return NULL;
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}
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s++;
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}
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return (char *)s;
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}
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char *
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strstr (
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const char *haystack,
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const char *needle
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)
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{
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const char *ptr = haystack;
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if (!*needle) {
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return (char *)haystack;
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}
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while ((ptr = strchr(ptr, *needle)) != NULL) {
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if (strcmp(ptr, needle) == 0) {
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return (char *)ptr;
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}
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}
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return NULL;
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}
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