scripts/kconfig/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 */
  17 static HASHTABLE_DEFINE(file_hashtable, 1U << 11);
  18
  19 struct file {
  20         struct hlist_node node;
  21         char name[];
  22 };
  23
  24 /* file already present in list? If not add it */
  25 const 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 */
  49 struct 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 */
  60 void 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 */
  68 void 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 */
  82 void 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 */
  93 char *str_get(const struct gstr *gs)
  94 {
  95         return gs->s;
  96 }