strtok.c - scc - simple c99 compiler
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       ---
       strtok.c (350B)
       ---
            1 #include <string.h>
            2 
            3 #undef strtok
            4 
            5 char *
            6 strtok(char * restrict s1, const char * restrict s2)
            7 {
            8         static char *line;
            9 
           10         if (s1)
           11                 line = s1;
           12         else if (!line)
           13                 return NULL;
           14 
           15         s1 = line + strspn(line, s2);
           16         if (*s1 == '\0')
           17                 return line = NULL;
           18 
           19         line = s1 + strcspn(s1, s2);
           20         if (*line == '\0')
           21                 line = NULL;
           22         else
           23                 *line++ = '\0';
           24 
           25         return s1;
           26 }