65 lines
1.2 KiB
C
65 lines
1.2 KiB
C
#include <lib/string.h>
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#include <stddef.h>
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static size_t kernel_strspn(const char *s, const char *accept) {
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const char *p;
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const char *a;
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size_t count = 0;
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for (p = s; *p != '\0'; ++p) {
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for (a = accept; *a != '\0'; ++a) {
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if (*p == *a)
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break;
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}
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if (*a == '\0')
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return count;
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++count;
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}
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return count;
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}
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static char *kernel_strpbrk(const char *s, const char *accept) {
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while (*s != '\0') {
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const char *a = accept;
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while (*a != '\0') {
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if (*s == *a) {
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return (char *)s;
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}
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a++;
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}
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s++;
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}
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return NULL;
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}
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char *strtok_r(char *str, const char *delim, char **saveptr) {
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char *token;
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if (str == NULL) {
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str = *saveptr;
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}
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if (str == NULL || *str == '\0') {
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*saveptr = NULL;
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return NULL;
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}
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str += kernel_strspn(str, delim);
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if (*str == '\0') {
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*saveptr = NULL;
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return NULL;
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}
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token = str;
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str = kernel_strpbrk(token, delim);
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if (str == NULL) {
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*saveptr = NULL;
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} else {
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*str = '\0';
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*saveptr = str + 1;
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}
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return token;
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} |