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Search a string from textfile

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Submitted on: 1/5/2015 5:10:00 AM
By: Markku Kauppinen (from psc cd)  
Level: Intermediate
User Rating: By 5 Users
Compatibility: C
Views: 1171
 
     Searches if a textfile contains a string that you specify. If matching string is found, the line# and the line, where your searchstring was found, will be printed to the screen. Searchstring is case sensitive.
 
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//**************************************
// Name: Search a string from textfile
// Description:Searches if a textfile contains a string that you specify. If matching string is found, the line# and the line, where your searchstring was found, will be printed to the screen. Searchstring is case sensitive.
// By: Markku Kauppinen (from psc cd)
//
// Inputs:filename as argv[1], and string to search as argv[2].
//
// Returns:Line# and the line where the string was found.
//**************************************

/*************************************************************************
 License : You're free to use this piece of code in your projects.
 But if you use it, drop me an email about it, or greet me
 in your project notes.
*************************************************************************/
#include <stdio.h>
#include <string.h>
char searchstring(char*, char*);
#define linelength 250
int main(int argc, char* argv[])
{
 if( argc != 3 ) {
 printf("Usage: search.exe <filename> \"<searchstring>\"\n");
 return 1;
 }
 searchstring(argv[1], argv[2]);
 return 0;
}
char searchstring(char* filename, char* string)
{
 FILE* file;
 char buffer[linelength];
 int line=0;
 unsigned int x, y, u;
 if( (file = fopen(filename, "rb")) == NULL ) {
 printf("File read error!\n");
 return 1;
 }
 
 while(1) {
 y = 0;
 u = 0;
 fgets(buffer, linelength, file);
 line++;
 
 if( feof(file) ) {
 break;
 }
 
 for(x = 0; x < strlen(buffer); x++) {
 if( buffer[y] == string[u] ) {
y++;
u++;
if( u == strlen(string) ) {
printf("Line %d: %s", line, buffer);
}
 }
 if( buffer[y] != string[u] ) {
u = 0;
y++;
 }
 }
 }
 fclose(file);
 return 0;
}


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