So a while ago I had someone make me a tool in C that lets you randomize set-words with other random words that you can both write down yourself in the program. However after 20 entries the program just freezes and crashes. I only have basic knowledge in coding can't couldn't see what was causing it. Maybe a memory overflow of some kind?
Here is the code. I can't reach the guy who wrote it anymore so if someone could have a look I would greatly appreciate it a lot!
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <malloc.h>
#define BUFFER_SIZE 1000
void replaceAll(char *str, const char *oldWord, const char *newWord);
int main()
{
int updates=0;
char **upd_array ;
printf("Enter number of words for replacements: ");
scanf("%d", &updates);
upd_array=(char**)malloc(updates+1*sizeof(char*));
//upd_array = calloc(updates, sizeof *upd_array);
int x=0;
for(x=0 ; x<updates ; x++)
{
upd_array[x] = (char*)malloc(30*sizeof(char));
}
int i=0;
for(i=0 ; i<updates ; i++)
{
printf("Enter word: \n");
scanf("%s" ,upd_array[i]);
}
printf("list of word for updating");
printf("\n");
for(i=0 ; i<updates ; i++)
{
printf("%s",upd_array[i]);
printf("\n");
}
int count=0;
do{
/* File pointer to hold reference of input file */
FILE * fPtr;
FILE * fTemp;
char path[100];
char buffer[BUFFER_SIZE];
char oldWord[100], newWord[100];
printf("Enter path of source file: ");
scanf("%s", path);
printf("Enter word to replace: ");
scanf("%s", oldWord);
/* Open all required files */
fPtr = fopen(path, "r");
fTemp = fopen("replace.tmp", "w");
/* fopen() return NULL if unable to open file in given mode. */
if (fPtr == NULL || fTemp == NULL)
{
/* Unable to open file hence exit */
printf("\nUnable to open file.\n");
printf("Please check whether file exists and you have read/write privilege.\n");
exit(EXIT_SUCCESS);
}
/*
* Read line from source file and write to destination
* file after replacing given word.
*/
while ((fgets(buffer, BUFFER_SIZE, fPtr)) != NULL)
{
// Replace all occurrence of word from current line
int r = rand() % updates;
strcpy(newWord , upd_array[r]);
replaceAll(buffer, oldWord, newWord);
// After replacing write it to temp file.
fputs(buffer, fTemp);
}
/* Close all files to release resource */
fclose(fPtr);
fclose(fTemp);
/* Delete original source file */
remove(path);
/* Rename temp file as original file */
rename("replace.tmp", path);
printf("\nSuccessfully replaced all occurrences of '%s'.\n", oldWord);
printf("1 for continue 0 for terminate: ");
scanf("%d", &count);
}while(count);
free(upd_array);
return 0;
}
/**
* Replace all occurrences of a given a word in string.
*/
void replaceAll(char *str, const char *oldWord, const char *newWord)
{
char *pos, temp[BUFFER_SIZE];
int index = 0;
int owlen;
//printf("in replace function");
owlen = strlen(oldWord);
/*
* Repeat till all occurrences are replaced.
*/
while ((pos = strstr(str, oldWord)) != NULL)
{
// Backup current line
strcpy(temp, str);
// Index of current found word
index = pos - str;
// Terminate str after word found index
str[index] = '\0';
// Concatenate str with new word
strcat(str, newWord);
// Concatenate str with remaining words after
// oldword found index.
strcat(str, temp + index + owlen);
}
}
