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 /* Allocate initial growable string */
  33 struct gstr str_new(void)
  34 {
  35         struct gstr gs;
  36         gs.s = xmalloc(sizeof(char) * 64);
  37         gs.len = 64;
  38         gs.max_width = 0;
  39         strcpy(gs.s, "\0");
  40         return gs;
  41 }
  42
  43 /* Free storage for growable string */
  44 void str_free(struct gstr *gs)
  45 {
  46         if (gs->s)
  47                 free(gs->s);
  48         gs->s = NULL;
  49         gs->len = 0;
  50 }
  51
  52 /* Append to growable string */
  53 void str_append(struct gstr *gs, const char *s)
  54 {
  55         size_t l;
  56         if (s) {
  57                 l = strlen(gs->s) + strlen(s) + 1;
  58                 if (l > gs->len) {
  59                         gs->s = xrealloc(gs->s, l);
  60                         gs->len = l;
  61                 }
  62                 strcat(gs->s, s);
  63         }
  64 }
  65
  66 /* Append printf formatted string to growable string */
  67 void str_printf(struct gstr *gs, const char *fmt, ...)
  68 {
  69         va_list ap;
  70         char s[10000]; /* big enough... */
  71         va_start(ap, fmt);
  72         vsnprintf(s, sizeof(s), fmt, ap);
  73         str_append(gs, s);
  74         va_end(ap);
  75 }
  76
  77 /* Retrieve value of growable string */
  78 const char *str_get(struct gstr *gs)
  79 {
  80         return gs->s;
  81 }
  82
  83 void *xmalloc(size_t size)
  84 {
  85         void *p = malloc(size);
  86         if (p)
  87                 return p;
  88         fprintf(stderr, "Out of memory.\n");
  89         exit(1);
  90 }
  91
  92 void *xcalloc(size_t nmemb, size_t size)
  93 {
  94         void *p = calloc(nmemb, size);
  95         if (p)
  96                 return p;
  97         fprintf(stderr, "Out of memory.\n");
  98         exit(1);
  99 }
 100
 101 void *xrealloc(void *p, size_t size)
 102 {
 103         p = realloc(p, size);
 104         if (p)
 105                 return p;
 106         fprintf(stderr, "Out of memory.\n");
 107         exit(1);
 108 }
 109
 110 char *xstrdup(const char *s)
 111 {
 112         char *p;
 113
 114         p = strdup(s);
 115         if (p)
 116                 return p;
 117         fprintf(stderr, "Out of memory.\n");
 118         exit(1);
 119 }
 120
 121 char *xstrndup(const char *s, size_t n)
 122 {
 123         char *p;
 124
 125         p = strndup(s, n);
 126         if (p)
 127                 return p;
 128         fprintf(stderr, "Out of memory.\n");
 129         exit(1);
 130 }