Thread: how to retain an allocated memory

Thanks Salem! That was actually helpful. Here's the working code below.

PHP Code:

[code]
#include <stdio.h>
#include <stdlib.h>

void my_strcpy(char **dest, char *src) {
    *dest = (char *) malloc(strlen(src) + 1);
    
    char *d = *dest;
    while(*src) {
        *d++ = *src++;
    }
    *d = '\0';
}

int main(void) {
    char *content1;
    char *content2 = "hello world";
    
    printf("%s\n", content2);
    
    my_strcpy(&content1, content2);
    
    printf("%s\n", content1);
    
    return 0;
}
[/code] 


Oh just don't forget to free() after you're done.

Finally wrote the function I wanted to make with help of pass-by-reference.

The code below would allow to load a ASCII file content (hopefully with binary file too) into an uninitialized string.

PHP Code:

[code]
#include <stdio.h>
#include <stdlib.h>

int flen(FILE *flen_file); //returns length of a file
int fget(char **dest, FILE *fget_file); //returns all the content of a file
int fload(char **dest, const char *file_name); //loads file_name into dest

int main(void) {
    char *content;
    
    int err = fload(&content, "test.txt");
    
    if (err == 0) {
        printf("%s\n", content);
    }
    free(content);
    
    return 0;
}

int flen(FILE *flen_file) {
    int size;
    
    fseek(flen_file, 0, SEEK_END);
        size = ftell(flen_file);
    fseek(flen_file, 0, SEEK_SET);
    
    return size;
}

int fget(char **dest, FILE *fget_file) {
    int LOF = flen(fget_file);
    
    *dest = malloc(sizeof(char) * (LOF + 1));
    char *d = *dest;
    int i = 0;
    while (i < LOF) {
        *d++ = fgetc(fget_file);
        i++;
    }
    *d = '\0';
    
    return 0;
}

int fload(char **dest, const char *file_name) {
    FILE *tmp_file = fopen(file_name, "rb");
    
    if (tmp_file != NULL) {
        if (fget(dest, tmp_file) == 0) {
            return 0;
        } else {
            return 2;
        }
    } else {
        return 1;
    }
}
[/code] 


Now tell me those where created from random commands.

whoa, don't forget those who guided you from random crap to code.