#include <stdlib.h>

#include <string.h>

#include <unistd.h>

#include <gclib/mem.h>

#include <gclib/strfuncs.h>

#include <gclib/utils.h>

#define is_valid_drive(d)	((d)>='a' && (d)<='z' || (d)>='A' && (d)<='Z')

/*

 * Gets the last component of the filename. If filename ends with a directory

 * separator it gets the component before the last slash. If filename consists

 * only of directory separators (and on Windows, possibly a drive letter), a

 * single separator is returned. If filename is empty, it gets ".".

 */

char *path_get_basename(const char *filename)

{

    ssize_t base,last_nonslash;

    size_t len;

    char *retval;

    if (*filename=='\0')

        return str_dup(".");

    last_nonslash=strlen(filename)-1;

    while (last_nonslash>=0 && GC_IS_DIR_SEPARATOR(filename[last_nonslash]))

	last_nonslash--;

    if (last_nonslash<0)

	/* string only containing slashes */

    return str_dup(GC_DIR_SEPARATOR_S);

#ifdef WIN32

    if (last_nonslash==1 && is_valid_drive(filename[0]) && filename[1]==':')

	/* string only containing slashes and a drive */

	return str_dup(GC_DIR_SEPARATOR_S);

#endif

    base=last_nonslash;

    while (base>=0 && !GC_IS_DIR_SEPARATOR(filename[base]))

	base--;

#ifdef WIN32

    if (base==-1 && is_valid_drive(filename[0]) && filename[1] == ':')

	  base=1;

#endif

    len=last_nonslash-base;

    retval=mem_alloc(len+1,1);

    memcpy(retval,filename+base+1,len);

    retval[len]='\0';

    return retval;

}