How can I read an XML file into a buffer in C?

Question

I want to read an XML file into a char *buffer using C.

What is the best way to do this?

How should I get started?

Answer 1

Hopefully bug-free ISO-C code to read the contents of a file and add a '\0' char:

#include 
#include 

long fsize(FILE * file)
{
    if(fseek(file, 0, SEEK_END))
        return -1;

    long size = ftell(file);
    if(size < 0)
        return -1;

    if(fseek(file, 0, SEEK_SET))
        return -1;

    return size;
}

size_t fget_contents(char ** str, const char * name, _Bool * error)
{
    FILE * file = NULL;
    size_t read = 0;
    *str = NULL;
    if(error) *error = 1;

    do
    {
        file = fopen(name, "rb");
        if(!file) break;

        long size = fsize(file);
        if(size < 0) break;

        if(error) *error = 0;

        *str = malloc((size_t)size + 1);
        if(!*str) break;

        read = fread(*str, 1, (size_t)size, file);
        (*str)[read] = 0;
        *str = realloc(*str, read + 1);

        if(error) *error = (size != (long)read);
    }
    while(0);

    if(file) fclose(file);
    return read;
}