scripts/kconfig/util.c

   1 /*
   2  * Copyright (C) 2002-2005 Roman Zippel <zippel@linux-m68k.org>
   3  * Copyright (C) 2002-2005 Sam Ravnborg <sam@ravnborg.org>
   4  *
   5  * Released under the terms of the GNU GPL v2.0.
   6  */
   7
   8 #include <string.h>
   9 #include "lkc.h"
  10
  11 /* file already present in list? If not add it */
  12 struct file *file_lookup(const char *name)
  13 {
  14         struct file *file;
  15
  16         for (file = file_list; file; file = file->next) {
  17                 if (!strcmp(name, file->name))
  18                         return file;
  19         }
  20
  21         file = malloc(sizeof(*file));
  22         memset(file, 0, sizeof(*file));
  23         file->name = strdup(name);
  24         file->next = file_list;
  25         file_list = file;
  26         return file;
  27 }
  28
  29 /* write a dependency file as used by kbuild to track dependencies */
  30 int file_write_dep(const char *name)
  31 {
  32         struct file *file;
  33         FILE *out;
  34
  35         if (!name)
  36                 name = ".config.cmd";
  37         out = fopen("..config.tmp", "w");
  38         if (!out)
  39                 return 1;
  40         fprintf(out, "deps_config := \\\n");
  41         for (file = file_list; file; file = file->next) {
  42                 if (file->next)
  43                         fprintf(out, "\t%s \\\n", file->name);
  44                 else
  45                         fprintf(out, "\t%s\n", file->name);
  46         }
  47         fprintf(out, "\n.config include/linux/autoconf.h: $(deps_config)\n\n$(deps_config):\n");
  48         fclose(out);
  49         rename("..config.tmp", name);
  50         return 0;
  51 }
  52
  53
  54 /* Allocate initial growable sting */
  55 struct gstr str_new(void)
  56 {
  57         struct gstr gs;
  58         gs.s = malloc(sizeof(char) * 64);
  59         gs.len = 16;
  60         strcpy(gs.s, "\0");
  61         return gs;
  62 }
  63
  64 /* Allocate and assign growable string */
  65 struct gstr str_assign(const char *s)
  66 {
  67         struct gstr gs;
  68         gs.s = strdup(s);
  69         gs.len = strlen(s) + 1;
  70         return gs;
  71 }
  72
  73 /* Free storage for growable string */
  74 void str_free(struct gstr *gs)
  75 {
  76         if (gs->s)
  77                 free(gs->s);
  78         gs->s = NULL;
  79         gs->len = 0;
  80 }
  81
  82 /* Append to growable string */
  83 void str_append(struct gstr *gs, const char *s)
  84 {
  85         size_t l = strlen(gs->s) + strlen(s) + 1;
  86         if (l > gs->len) {
  87                 gs->s   = realloc(gs->s, l);
  88                 gs->len = l;
  89         }
  90         strcat(gs->s, s);
  91 }
  92
  93 /* Append printf formatted string to growable string */
  94 void str_printf(struct gstr *gs, const char *fmt, ...)
  95 {
  96         va_list ap;
  97         char s[10000]; /* big enough... */
  98         va_start(ap, fmt);
  99         vsnprintf(s, sizeof(s), fmt, ap);
 100         str_append(gs, s);
 101         va_end(ap);
 102 }
 103
 104 /* Retreive value of growable string */
 105 const char *str_get(struct gstr *gs)
 106 {
 107         return gs->s;
 108 }
 109