C: Parse empty tokens from a string with strtok

Question

My application produces strings like the one below. I need to parse values between the separator into individual values.

2342|2sd45|dswer|2342||5523|||3654|         


        

Answer 1

char *mystrtok(char **m,char *s,char c)
{
  char *p=s?s:*m;
  if( !*p )
    return 0;
  *m=strchr(p,c);
  if( *m )
    *(*m)++=0;
  else
    *m=p+strlen(p);
  return p;
}

• reentrant
• threadsafe
• strictly ANSI conform
• needs an unused help-pointer from calling context

e.g.

char *p,*t,s[]="2342|2sd45|dswer|2342||5523|||3654|Pswt";
for(t=mystrtok(&p,s,'|');t;t=mystrtok(&p,0,'|'))
  puts(t);

e.g.

char *p,*t,s[]="2,3,4,2|2s,d4,5|dswer|23,42||5523|||3654|Pswt";
for(t=mystrtok(&p,s,'|');t;t=mystrtok(&p,0,'|'))
{
  char *p1,*t1;
  for(t1=mystrtok(&p1,t,',');t1;t1=mystrtok(&p1,0,','))
    puts(t1);
}

your work :) implement char *c as parameter 3