libc

my libc
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strtok.c (765B)

      1 /*
      2  * strtok.c - extract tokens from string
      3  * Copyright (C) 2026. All rights reserved.
      4  */
      5 
      6 #include "libc.h"
      7 
      8 char* strtok(char *str, const char *delim) {
      9   static char *next_token = NULL;
     10 
     11   if (str != NULL) {
     12     next_token = str;
     13   }
     14 
     15   if (next_token == NULL) {
     16     return NULL;
     17   }
     18 
     19   char *token_start =  next_token;
     20   while (*token_start != '\0' && strchr(delim, *token_start) != NULL) {
     21     token_start++;
     22   }
     23 
     24   if (*token_start == '\0') {
     25     next_token = NULL;
     26     return NULL;
     27   }
     28 
     29   char *token_end = token_start;
     30   while (*token_end != '\0' && strchr(delim, *token_end) == NULL) {
     31     token_end++;
     32   }
     33 
     34   if (*token_end != '\0') {
     35     *token_end = '\0';
     36     next_token = token_end + 1;
     37   } else {
     38     next_token = NULL;
     39   }
     40 
     41   return token_start;
     42 }