100 lines
2 KiB
C
100 lines
2 KiB
C
/* path.c - path handling routines
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*
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* Copyright (C) 2010 Henrik Hautakoski <henrik.hautakoski@gmail.com>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* The design goal here is to not use fixed size buffers because
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* path's can be extremely long (slightly overexaggerated but extreme cases are extreme).
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* so we use funky heap memory based algorithms instead :)
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*/
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#include <string.h>
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#include <stdlib.h>
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#include "debug.h"
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#include "strbuf.h"
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#include "path.h"
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static char path_null = '\0';
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static const char* path_clear(const char *path) {
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while(*path == '/')
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path++;
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return path;
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}
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static inline int has_delim(const char *str) {
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if (str == NULL)
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return 0;
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return strchr(str, '/') != NULL;
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}
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int is_abspath(const char *path) {
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if (path == NULL || *path != '/')
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return 0;
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for(; *path; path++) {
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if (*path == '/' && *(path+1) == '.') {
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path += 2;
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if (*path == '.')
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path++;
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if (*path == '/' || *path == '\0')
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return 0;
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}
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}
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return 1;
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}
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static char* expand_home() {
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char *home = getenv("HOME");
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if (!home)
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home = &path_null;
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return home;
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}
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char* path_normalize(const char *base, const char *name, unsigned char dir) {
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strbuf_t sb = STRBUF_INIT;
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if (base == NULL || has_delim(name))
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return NULL;
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if (*base == '~') {
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base++;
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strbuf_append_str(&sb, expand_home());
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strbuf_term(&sb, '/');
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}
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strbuf_append_str(&sb, base);
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strbuf_term(&sb, '/');
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if (!is_abspath(sb.buf))
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goto cleanup;
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if (name) {
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strbuf_append_str(&sb, name);
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if (dir)
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strbuf_append_ch(&sb, '/');
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}
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strbuf_squeeze(&sb, '/');
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return strbuf_release(&sb);
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cleanup:
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strbuf_free(&sb);
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return NULL;
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}
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