Replace a word of a file using cmd

[CarmesiD]

Hello people i've done a program that replace a letter for another one using cmd. But i'm having issues trying to replace a whole word. i'm new using files, so i've tried to use fgets and fputs, but i had no results. :/


This is my code:

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

//Function's prototypes
void atributos(int argc,char *argv[]);
void SustChar(char *argv[]);


//MAIN
int main(int argc, char *argv[]){
    
    
FILE *ptrf;
ptrf=fopen(argv[1],"r");
if(ptrf==NULL){
    printf("No se pudo abrir el archivo\n");
    exit(1);
}
else{
    fclose(ptrf);
    atributos(argc,argv);
}
    
    return 0;
}

//attributes


void atributos(int argc,char *argv[]){
    if(strcmp(argv[2],"S")==0)
    SustChar(argv);
}

//Replace words


void SustChar(char *argv[]){
    char c[80];
    
FILE *ptrf;
ptrf=fopen(argv[1],"r");
    FILE *ptrs;
    ptrs=fopen(argv[5],"w");
    
    while(!feof(ptrf)){    
    
    
    c=fgetc(ptrf);
    if(c==*argv[3])
        fputc(*argv[4],ptrs);
    else
        fputc(c,ptrs);    
}
    fclose(ptrs);
    fclose(ptrf);
    
}

The sintaxis i'm using on cmd is: .exeName origin.txt S oldword newword destiny.txt

[christophergray]

fgets(c, sizeof c, ptrf);
if (strcmp(c, argv[3]))
  fputs(argv[4], ptrs);
else
  fputs(c, ptrs);

[GReaper]

You shouldn't use feof() as the condition for the loop, not in that way at least. feof() returns true only after the end was reached, meaning that the fgetc() you use there returns EOF, and you mistakenly assume that EOF to be a character and write it to the other file with fputc().