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Old 01-11-2013, 07:09 AM   #1
micflunu
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Registered: Oct 2012
Posts: 73

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strcmp not working correctly


What is the return value of strcmp in c.I wrote the following code in c.
Code:
char parse(char buffer[],int i)
{
 
             buffer[i] = '\0';
             argument[0] = strtok(buffer, " ");
             numberOfArguments = 1;
             argument[numberOfArguments] = strtok(NULL, " ");
             while (argument[numberOfArguments] != NULL) {
             numberOfArguments++;
             argument[numberOfArguments] = strtok(NULL, " ");
                           }  
                                
  return  numberOfArguments;                               
}
changeDirectory(char buffer[],int i){
   parse(buffer,i);     
int l=0;
                                   while(l<numberOfArguments+1){
                                   printf("argument [%d] is %s\n",l,argument[l]);
                                     l++;
}
int main(){
char *s;
while(1)
       {
            printf("myshell>> ");  
            int i = 0; 
         
             while ((i < MAX) && ((buffer[i] = getchar()) != '\n') && buffer[i] != EOF)
                i++;
               if (i == MAX) {
                          buffer[MAX-1] = '\0';
                          while (getchar() != '\n');
                          printf("argument too long\n");
                       }
if (!strcmp(argument[0], "cd"))
  changeDirectory(buffer,i);
the out put is always Null after argument[0].That means some how it is loosing the input after "cd".Why is that does strcmp turn the other valus after cd to null???
 
Old 01-11-2013, 07:47 AM   #2
linosaurusroot
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Registered: Oct 2012
Distribution: OpenSuSE,RHEL,Fedora,OpenBSD
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It looks as if you are using the argument array (in main()) before populating it (in parse()).
 
  


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