/*Description: This program performs a search and replace for a specified target and replacement string. It will prompt for a string to be searched, a target string
to be replaced, and then prompt for a replacement string to replace each target occurrence. The program will repeat, asking for three new strings until
a NULL string is entered for the string to be searched, ie. the <Enter Key> only being pressed.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define MAX_STR 100
int main(void)
{
//Variable declarations
char document[MAX_STR], target[MAX_STR], replacement[MAX_STR];
//Welcome user
printf("This program performs a search and replace for a specified target and\nreplacement string. It will prompt for a string to be searched, a target string\n");
printf("to be replaced, and then prompt for a replacement string to replace each target\noccurrence. The program will repeat, asking for three new strings until a\n");
printf("NULL string is entered for the string to be searched, ie. only the <Enter Key>\nis pressed.\n");
for (;;)
{
//Prompt for and scan in user input
printf("\nPlease enter a string to search: ");
fgets(document, MAX_STR, stdin);
//Terminates loop when conditions met
if ((strlen(document) == 0) || (strlen(document) == 1))
return 0;
else
document[strlen(document) - 1] = '\0';
//Continue scanning user input
printf("\nPlease enter the target string to search for: ");
scanf("%s", &target);
printf("\nPlease enter the target replacement string: ");
scanf("%s", &replacement);
//Get string lengths
int docL, tarL, repL;
docL = strlen(document);
tarL = strlen(target);
repL = strlen(replacement);
//Pointer to 1st occurence of target in document
char *occurence = strstr(document, target);
//Checks to see if target string occurs in document string
if (occurence == NULL)
{
printf("\nNo match found!\n");
printf("%s\n", document);
}
else //Replace occurence of target in document
{
strncpy(occurence, target, tarL);
puts(document);
printf("%s\n", document);
}
}
}
