util.c

 1// SPDX-License-Identifier: GPL-2.0
 2/*
 3 * Copyright (C) 2002-2005 Roman Zippel <zippel@linux-m68k.org>
 4 * Copyright (C) 2002-2005 Sam Ravnborg <sam@ravnborg.org>
 5 */
 6
 7#include <stdarg.h>
 8#include <stdlib.h>
 9#include <string.h>
10
11#include <hash.h>
12#include <hashtable.h>
13#include <xalloc.h>
14#include "lkc.h"
15
16/* hash table of all parsed Kconfig files */
17static HASHTABLE_DEFINE(file_hashtable, 1U << 11);
18
19struct file {
20	struct hlist_node node;
21	char name[];
22};
23
24/* file already present in list? If not add it */
25const char *file_lookup(const char *name)
26{
27	struct file *file;
28	size_t len;
29	int hash = hash_str(name);
30
31	hash_for_each_possible(file_hashtable, file, node, hash)
32		if (!strcmp(name, file->name))
33			return file->name;
34
35	len = strlen(name);
36	file = xmalloc(sizeof(*file) + len + 1);
37	memset(file, 0, sizeof(*file));
38	memcpy(file->name, name, len);
39	file->name[len] = '\0';
40
41	hash_add(file_hashtable, &file->node, hash);
42
43	str_printf(&autoconf_cmd, "\t%s \\\n", name);
44
45	return file->name;
46}
47
48/* Allocate initial growable string */
49struct gstr str_new(void)
50{
51	struct gstr gs;
52	gs.s = xmalloc(sizeof(char) * 64);
53	gs.len = 64;
54	gs.max_width = 0;
55	strcpy(gs.s, "\0");
56	return gs;
57}
58
59/* Free storage for growable string */
60void str_free(struct gstr *gs)
61{
62	free(gs->s);
63	gs->s = NULL;
64	gs->len = 0;
65}
66
67/* Append to growable string */
68void str_append(struct gstr *gs, const char *s)
69{
70	size_t l;
71	if (s) {
72		l = strlen(gs->s) + strlen(s) + 1;
73		if (l > gs->len) {
74			gs->s = xrealloc(gs->s, l);
75			gs->len = l;
76		}
77		strcat(gs->s, s);
78	}
79}
80
81/* Append printf formatted string to growable string */
82void str_printf(struct gstr *gs, const char *fmt, ...)
83{
84	va_list ap;
85	char s[10000]; /* big enough... */
86	va_start(ap, fmt);
87	vsnprintf(s, sizeof(s), fmt, ap);
88	str_append(gs, s);
89	va_end(ap);
90}
91
92/* Retrieve value of growable string */
93char *str_get(const struct gstr *gs)
94{
95	return gs->s;
96}