src/util/texpand.c

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/*
 * Revision Control Information
 *
 * $Id: texpand.c,v 1.4 2009/01/05 21:04:04 fabio Exp $
 *
 */

#include "util.h"

#if HAVE_PWD_H
#  include <pwd.h>
#endif


char *
util_tilde_expand(char const *fname)
{
#if HAVE_PWD_H
    struct passwd *userRecord;
    char username[256], *filename, *dir;
    register int i, j;

    filename = ALLOC(char, strlen(fname) + 256);

    /* Clear the return string */
    i = 0;
    filename[0] = '\0';

    /* Tilde? */
    if (fname[0] == '~') {
        j = 0;
        i = 1;
        while ((fname[i] != '\0') && (fname[i] != '/')) {
            username[j++] = fname[i++];
        }
        username[j] = '\0';
        dir = (char *)0;
        if (username[0] == '\0') {
            /* ~/ resolves to home directory of current user */
            userRecord = getpwuid(getuid());
            if (userRecord) dir = userRecord->pw_dir;
        } else {
            /* Special check for ~octtools */
            if (!strcmp(username,"octtools"))
                dir = getenv("OCTTOOLS");
            /* ~user/ resolves to home directory of 'user' */
            if (!dir) {
                userRecord = getpwnam(username);
                if (userRecord) dir = userRecord->pw_dir;
            }
        }
        if (dir) (void) strcat(filename, dir);
        else i = 0;     /* leave fname as-is */
    } /* if tilde */

    /* Concantenate remaining portion of file name */
    (void) strcat(filename, fname + i);
    return filename;
#else
    return util_strsav(fname);
#endif
}

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