Problem with strcmp usage

here is code

void process(char *input)
{
char *s;
char s1[100];
s=strtok(input,":");

while(1)
{
  if(strcmp(s,"regular")==开发者_如何转开发0)// the strcmp is not working
  {
  s=strtok(NULL,",");
  if(s==NULL)
  break;
  }
}

actually the input to the function process is

i/p:          regular:ddf

but when i extract the token using strtok func and display s it is printing as "regular" correctly, but when i use "s" in strcmp(s,"regular")==0 it is not working. what is the problem????

Given your input, the s parameter to strcmp is

"          regular"

not

"regular" 

Thus, no match, and, as a result, the code in the if block never runs and your while loop will never terminate.

Here's a function (and a complete program showing how to use it) that does what I think you want. Given the input of "i/p: regular:ddf" it prints:

Token found: "i/p" Token found: "regular" Regular! Token found: "ddf"

#include <stdio.h>
#include <string.h>

void process(char * input)
{
    char * s = strtok(input, ": ");  // Get first token.  Colon AND space are delimiters.
    while(1)
    {
        if (s == NULL)
        {
            break;   // No more tokens.
        }

        printf("Token found: \"%s\"\n", s);
        if(strcmp(s,"regular")==0)
        {
            printf("Found \"regular\" token.\n");
        }

        s = strtok(NULL, ": ");  // Get next token.
    }
}

int main(int argc, char **argv)
{
    char str[] = "i/p:          regular:ddf";
    process(str); // Warning: process(str) will modify str
}

One big drawback to this approach, however, if that you can't call strtok anywhere else in the loop because this function relies on the internal state that is stored by strtok when it calls strtok with a NULL argument.