使用System从C代码执行程序

Question

I'm writing c program which get as inputs execution fileName and txt fileName. My program should run the exe file with the strings from the txt file in the next format: ./exename ./fileName.. I read each line from the text file with fgets() function. I'm using system() function to run the exe from my code. this is my code

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

#define READSIZE 100


int main(int argc,char *argv[]){

    FILE * src;
    //char path[] ="home/omriz/playGround/Cyber/ex4/1/prog1strings.txt";    
    char buffer[READSIZE];
    int i;
    int status;
    char *result = malloc(strlen(argv[2]) + strlen(buffer)+2);//+1 for the zero-terminator


    if(argc < 3){
        printf("prototype error <exe file to run><strings txt file txt>\n");
        return -1;
    }
    printf ("exe file path is : %s \n",argv[1]);
    printf ("src file path is : %s \n",argv[2]);

    src = fopen(argv[2],"r");

    while(!(feof(src))){
        fgets(buffer,READSIZE,src);
        printf("string read from txt file is: %s\n",buffer);
        *result = malloc(strlen(argv[2])+strlen(buffer)+2);
        strcpy(result,argv[1]);
        strcat(result," ");
        strcat(result, buffer);
        printf("result is %s\n",result);
        printf("before sys command\n");
        status = system(result);
        printf("status value is %d\n",status);
    }
    printf("we reached the end of the string.txt file\n");
    free(result);
    fclose(src);
}

The problem is that the program exits before it read all the lines from the text file and I don't know why.

the exe file which I run from my code should return string value like "True" or "False" how can I catch this values considering using the system() function?

thanks.

Answer 1

*result = malloc(strlen(argv[2])+strlen(buffer)+2);

result is a char* , so this is an error (just remove the *)

edit: a little bit of explaination

malloc return a void *, so here you are setting the 1byte pointed by result to the pointer return by malloc