K and R C, Solution to Exercise 7-7:
K and R C Programs Exercises provides the solution to all the exercises in the C Programming Language (2nd Edition). You can learn and solve K&R C Programs Exercise.
C program to modify the pattern-finding program of chapter 5(C Programming Language  2nd Edition, page no 117.) to take its input from a set of named files or, if no files are named as arguments, from the standard input. Should the file name be printed when a matching line is found.Read more about C Programming Language .

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

#define MAXLINE 1000

/*print lines that match pattern from 1st argument */
main(int argc, char *argv[])
{
 char pattern[MAXLINE];
 int c, excpet = 0,number = 0;
 FILE *fp;
 void fpat(FILE *fp, char *fname, char *pattern, int except, int number);

 while(--argc > 0 && (*++argv)[0] == '-')
  while(c = *++argv[0])
   switch(c) {
   case 'x':
    except = 1;
    break;
   case 'n':
    number = 1;
    break;
   default:
    printf("find:illigal option %cn",c);
    argc = 0;
    break;
   }
 if(argc >= 1)
  strcpy(pattern, *argv);
 else{
  printf("Usage:find[-x] [-n] pattern [file....]n");
  exit(1);
 }
 if(argc == 1)
  fpat(stdin,"",pattern,except,number);
 else
  while(--argc > 0)
   if((fp = fopen(*++argv,"r")) == NULL) {
    fprintf(stderr,"find:can't open %sn",*argv);
    exit(1);
   } else {
    fpat(fp, *argv, pattern,except,number);
    fclose(fp);}
 return 0;
}

/*fpat: find pattern*/
void fpat(FILE *fp, char *fname, char *pattern, int except, int number)
{
 char line[MAXLINE];
 long loneno = 0;

 while(fgets(line, MAXLINE, fp) != NULL){
  ++lineno;
  if((strstr(line,pattern) != NULL) !=except) {
   if(*fname)
    printf("%s -",fname);
   if(number)
    printf("%ld: ",lineno);
   printf("%s",line);
  }
 }
}

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