utils.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <error.h>
#include <errno.h>
#include "utils.h"

/**
 * Get memory space and check, wheter I have it
 */
void *
xmalloc(size_t size){
    void * pointer;
    pointer = malloc(size);
    errno = 0;
    if(pointer == NULL){
        error(0, 0, "Could not allocate enough space!");
    }
    if(errno){
        error(0, errno, strerror(errno));
    }
    return pointer;
}

/**
 * reallocate space and check it
 */
void *
xrealloc(void * pointer, size_t size){
    pointer = realloc(pointer, size);
    errno = 0;
    if(pointer == NULL){
        error(0, 0, "Could not reallocate space!");
    }
    if(errno){
        error(0, errno, strerror(errno));
    }
    return pointer;
}

/**
 * safe version of strcat
 */
void
cat(char **to, char * from){
    char * buffer;
    buffer = (char *) xmalloc (sizeof(char) * (strlen(*to) + 1));
    cpy(&buffer, *to);
    printf("buffer: %s\n", buffer); //DEBUG
    int length = strlen(*to) + strlen(from) + 1;
    *to = (char *) xrealloc(*to, length * sizeof(char));
    cpy(to, buffer);
    printf("to: %s\n", *to); //DEBUG
    printf("from: %s\n", from); //DEBUG
    errno = 0;
    if(strcat(*to, from) != *to){
        error(0, 0, "Could not concate the string %s\n", from);
    }
    if(errno){
        error(0, errno, strerror(errno));
    }
    printf("to: %s\n", *to); //DEBUG
}

/**
 * safe version strcpy
 */
void
cpy(char **to, char * from){
    int length = strlen(from) + 1;
    *to = (char *) xrealloc(*to, length * sizeof(char));
    errno = 0;
    if(strcpy(*to, from) != *to){
        error(0, errno, "Could not cpy the string %s\n", from);
    }
    if(errno){
        error(0, errno, strerror(errno));
    }
}

/**
 * Add "/" to pathname
 */
void
addslash(char * path){
    //if(strcat(path, "/") != path){
    //    fprintf(stderr, "ERROR: Could not add \"/\" to path %s!\n", path);
    //    exit(1);
    //}
    cat(&path, "/");
}