Find and print number after string in C

Applications Programming
1

I'm trying find and print a number after a specific user passed string in each line of a text file using C (as requested by the powers that be). I've pieced together enough to read the file, find the string and print the line it was found on but I�m not sure where to even start in terms of finding the number after the string. Any tips would be much appreciated.

The below code outputs the line number where the string is found:

/* usage exename textfile searchstring */
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
int main(int argc, char *argv[]) 
{ 
FILE *file; 
char line[BUFSIZ]; 
int linen = 1; 
file = fopen(argv[1], "r"); 
if(file != NULL) { 
  while(fgets(line, sizeof(line), file)){ 
     if(strstr(line, argv[2]) != NULL) { 
        printf("Found %s %s %i\n",argv[2],"@ line",linen); 
     }
 ++linen;     
 } 
} 
else { 
  perror(argv[1]); 
  perror(argv[2]); 
} 
fclose(file); 
return 0; 
}

My text file looks like below. I'm trying to print the number as is the file (2 decimals) after "val=".

123 test=123 val=233.33 x=111 y=222
123 test=123 val=.33 x=111 
123 xr=3 test=123 x=111 y=222
123 test=123 val=233. x=111 y=222
123 test=123 val=233.33 x=111 y=222
 
Output from current code:
Found val @ line 1
Found val @ line 2
Found val @ line 4
Found val @ line 5
2

This code has worked for one line string, you can use match() in your code

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

int match(char *ts,char *pattern);

int main()
{

        char *str="123 test=123 val=233.33 x=111 y=222 senth";
        char *ptt="senth";


        match(str,ptt);

}

int match(char *ts,char *pattern)
{

        char *pt=pattern;

        while(1)
        {
                printf ("comparing %c %c\n",*ts,*pt);
                while( *pt && *ts++ == *pt++)
                {
                        printf ("comparing %c %c\n",*ts,*pt);
                        ;
                }
                if(*pt == '\0')
                {
                        printf("match found %s\n",ts-strlen(pattern)-1);
                        break;
                }
                else if(*ts== '\0')
                {
                        printf("match not found \n");
                        // pattern not found
                        break;
                }
                        pt=(char *)pattern;
        }

}
3

store the pointer returned by strstr(), look for the '=' sign, and after that location perform a sscanf() for instance.

4

Thanks so much everyone!