Thread: string manipulation, strnspn() a text file

Code:

/* Write a program that searches a text file for occurrences of a user-specified target string and then reports the line numbers where the target is found.  For example, if you search one of your C source code files for the string "printf()", the program should list all the lines where the printf() funcction is called by the program. */

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

#define BUFSIZE 128

int main( void )
{
    char buf[BUFSIZE];
    char filename[60];
    FILE *fp;
    size_t loc;
    char string[80];

    if ( (fp = fopen("testfile.txt", "r")) == NULL)
    {
        fprintf(stderr, "Error opening file.");
        exit(1);
    }

    printf("Enter the string to be searched: ");
    fgets(string, 80, stdin);
    puts("\n");

    int count, line_num;

    count = 0;
    line_num = 0;

    while (!feof(fp))
    {
        line_num++;
        fgets(buf, BUFSIZE, fp);
        loc = strspn(string, buf);
        printf("%d %s", line_num, buf);
        if(feof(fp))
        {
            if ( loc == 0 )
                printf("\nNo match was found.\n");
            else
                printf("\nCharacters match up to postion %lu.\n", loc-1);
        }
    }
    
    fclose(fp);
    return(0);
}

text file, testfile.txt (for program):

Code:

apple banana mango strawberry Orange 100 200 300 +400 Watermelon

well...i've spent a few hours on this code. I looked through my programming book at the string manipulation functions, not exactly sure what one to use for this exercise, but i chose strspn(). Also, I switched up the format of the source text file, including adding a list of words instead of a line of words separated by spaces. The program in the exercise should only display the words that are matching by fgets, or string.