makepath_s.c File Reference

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

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Functions
int CDECL	_makepath_s (char *path, size_t size, const char *drive, const char *directory, const char *filename, const char *extension)

Function Documentation

_makepath_s()

int CDECL _makepath_s	(	char *	path,
		size_t	size,
		const char *	drive,
		const char *	directory,
		const char *	filename,
		const char *	extension
	)

Definition at line 23 of file makepath_s.c.

{
    char *p = path;
 
    if (!path || !size)
    {
        *_errno() = EINVAL;
        return EINVAL;
    }
 
    if (drive && drive[0])
    {
        if (size <= 2)
            goto range;
 
        *p++ = drive[0];
        *p++ = ':';
        size -= 2;
    }
 
    if (directory && directory[0])
    {
        size_t len = strlen(directory);
        unsigned int needs_separator = directory[len - 1] != '/' && directory[len - 1] != '\\';
        size_t copylen = min(size - 1, len);
 
        if (size < 2)
            goto range;
 
        memmove(p, directory, copylen);
 
        if (size <= len)
            goto range;
 
        p += copylen;
        size -= copylen;
 
        if (needs_separator)
        {
            if (size < 2)
                goto range;
 
            *p++ = '\\';
            size -= 1;
        }
    }
 
    if (filename && filename[0])
    {
        size_t len = strlen(filename);
        size_t copylen = min(size - 1, len);
 
        if (size < 2)
            goto range;
 
        memmove(p, filename, copylen);
 
        if (size <= len)
            goto range;
 
        p += len;
        size -= len;
    }
 
    if (extension && extension[0])
    {
        size_t len = strlen(extension);
        unsigned int needs_period = extension[0] != '.';
        size_t copylen;
 
        if (size < 2)
            goto range;
 
        if (needs_period)
        {
            *p++ = '.';
            size -= 1;
        }
 
        copylen = min(size - 1, len);
        memcpy(p, extension, copylen);
 
        if (size <= len)
            goto range;
 
        p += copylen;
    }
 
    *p = '\0';
    return 0;
 
range:
    path[0] = '\0';
    *_errno() = ERANGE;
    return ERANGE;
}