114 lines
2.2 KiB
C
114 lines
2.2 KiB
C
#include <stddef.h>
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#include <string/string.h>
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size_t string_len(const char *s) {
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size_t l = 0;
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while (*s != '\0') {
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l++;
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s++;
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}
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return l;
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}
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void *string_memset(void *p, int c, size_t n) {
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char *cp = p;
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for (size_t i = 0; i < n; i++) cp[i] = c;
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return p;
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}
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void *string_memcpy(void *dst, const void *src, size_t n) {
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char *a = dst;
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const char *b = src;
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for (size_t i = 0; i < n; i++) a[i] = b[i];
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return dst;
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}
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// https://aticleworld.com/memcmp-in-c/
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int string_memcmp(const void *s1, const void *s2, int len)
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{
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unsigned char *p = s1;
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unsigned char *q = s2;
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int charCompareStatus = 0;
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//If both pointer pointing same memory block
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if (s1 == s2)
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{
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return charCompareStatus;
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}
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while (len > 0)
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{
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if (*p != *q)
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{ //compare the mismatching character
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charCompareStatus = (*p >*q)?1:-1;
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break;
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}
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len--;
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p++;
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q++;
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}
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return charCompareStatus;
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}
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int string_strcmp(const char *a, const char *b) {
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while (*a && (*a == *b)) {
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a++, b++;
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}
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return (unsigned char)*a - (unsigned char)*b;
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}
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size_t string_strcspn(const char *s, const char *reject) {
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size_t count = 0;
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for (; *s != '\0'; ++s) {
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const char *r = reject;
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while (*r != '\0') {
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if (*s == *r) {
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return count;
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}
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r++;
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}
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count++;
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}
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return count;
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}
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size_t string_strspn(const char *s, const char *accept) {
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size_t count = 0;
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for (; *s != '\0'; ++s) {
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const char *a = accept;
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int matched = 0;
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while (*a != '\0') {
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if (*s == *a) {
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matched = 1;
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break;
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}
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a++;
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}
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if (!matched) {
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return count;
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}
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count++;
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}
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return count;
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}
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char *string_strcpy(char *dest, const char *src) {
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char *d = dest;
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while ((*d++ = *src++) != '\0') {
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;
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}
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return dest;
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}
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char *string_strchr(const char *s, int c) {
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char ch = (char)c;
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while (*s != '\0') {
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if (*s == ch) {
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return (char *)s;
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}
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s++;
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}
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if (ch == '\0') {
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return (char *)s;
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}
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return NULL;
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}
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