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 <stdarg.h>
   9 #include <stdlib.h>
  10 #include <string.h>
  11 #include "lkc.h"
  12
  13 /* file already present in list? If not add it */
  14 struct file *file_lookup(const char *name)
  15 {
  16         struct file *file;
  17
  18         for (file = file_list; file; file = file->next) {
  19                 if (!strcmp(name, file->name)) {
  20                         return file;
  21                 }
  22         }
  23
  24         file = xmalloc(sizeof(*file));
  25         memset(file, 0, sizeof(*file));
  26         file->name = xstrdup(name);
  27         file->next = file_list;
  28         file_list = file;
  29         return file;
  30 }
  31
  32 /* write a dependency file as used by kbuild to track dependencies */
  33 int file_write_dep(const char *name)
  34 {
  35         struct file *file;
  36         FILE *out;
  37
  38         if (!name)
  39                 name = ".kconfig.d";
  40         out = fopen("..config.tmp", "w");
  41         if (!out)
  42                 return 1;
  43         fprintf(out, "deps_config := \\\n");
  44         for (file = file_list; file; file = file->next) {
  45                 if (file->next)
  46                         fprintf(out, "\t%s \\\n", file->name);
  47                 else
  48                         fprintf(out, "\t%s\n", file->name);
  49         }
  50         fprintf(out, "\n%s: \\\n"
  51                      "\t$(deps_config)\n\n", conf_get_autoconfig_name());
  52
  53         env_write_dep(out, conf_get_autoconfig_name());
  54
  55         fprintf(out, "\n$(deps_config): ;\n");
  56         fclose(out);
  57         rename("..config.tmp", name);
  58         return 0;
  59 }
  60
  61
  62 /* Allocate initial growable string */
  63 struct gstr str_new(void)
  64 {
  65         struct gstr gs;
  66         gs.s = xmalloc(sizeof(char) * 64);
  67         gs.len = 64;
  68         gs.max_width = 0;
  69         strcpy(gs.s, "\0");
  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;
  86         if (s) {
  87                 l = strlen(gs->s) + strlen(s) + 1;
  88                 if (l > gs->len) {
  89                         gs->s = xrealloc(gs->s, l);
  90                         gs->len = l;
  91                 }
  92                 strcat(gs->s, s);
  93         }
  94 }
  95
  96 /* Append printf formatted string to growable string */
  97 void str_printf(struct gstr *gs, const char *fmt, ...)
  98 {
  99         va_list ap;
 100         char s[10000]; /* big enough... */
 101         va_start(ap, fmt);
 102         vsnprintf(s, sizeof(s), fmt, ap);
 103         str_append(gs, s);
 104         va_end(ap);
 105 }
 106
 107 /* Retrieve value of growable string */
 108 const char *str_get(struct gstr *gs)
 109 {
 110         return gs->s;
 111 }
 112
 113 void *xmalloc(size_t size)
 114 {
 115         void *p = malloc(size);
 116         if (p)
 117                 return p;
 118         fprintf(stderr, "Out of memory.\n");
 119         exit(1);
 120 }
 121
 122 void *xcalloc(size_t nmemb, size_t size)
 123 {
 124         void *p = calloc(nmemb, size);
 125         if (p)
 126                 return p;
 127         fprintf(stderr, "Out of memory.\n");
 128         exit(1);
 129 }
 130
 131 void *xrealloc(void *p, size_t size)
 132 {
 133         p = realloc(p, size);
 134         if (p)
 135                 return p;
 136         fprintf(stderr, "Out of memory.\n");
 137         exit(1);
 138 }
 139
 140 char *xstrdup(const char *s)
 141 {
 142         char *p;
 143
 144         p = strdup(s);
 145         if (p)
 146                 return p;
 147         fprintf(stderr, "Out of memory.\n");
 148         exit(1);
 149 }
 150
 151 char *xstrndup(const char *s, size_t n)
 152 {
 153         char *p;
 154
 155         p = strndup(s, n);
 156         if (p)
 157                 return p;
 158         fprintf(stderr, "Out of memory.\n");
 159         exit(1);
 160 }