util/kconfig/util.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   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 #include "lkc.h"
  11
  12 /* file already present in list? If not add it */
  13 struct file *file_lookup(const char *name)
  14 {
  15         struct file *file;
  16
  17         for (file = file_list; file; file = file->next) {
  18                 if (!strcmp(name, file->name)) {
  19                         return file;
  20                 }
  21         }
  22
  23         file = xmalloc(sizeof(*file));
  24         memset(file, 0, sizeof(*file));
  25         file->name = xstrdup(name);
  26         file->next = file_list;
  27         file_list = file;
  28         return file;
  29 }
  30
  31 /* Allocate initial growable string */
  32 struct gstr str_new(void)
  33 {
  34         struct gstr gs;
  35         gs.s = xmalloc(sizeof(char) * 64);
  36         gs.len = 64;
  37         gs.max_width = 0;
  38         strcpy(gs.s, "\0");
  39         return gs;
  40 }
  41
  42 /* Free storage for growable string */
  43 void str_free(struct gstr *gs)
  44 {
  45         if (gs->s)
  46                 free(gs->s);
  47         gs->s = NULL;
  48         gs->len = 0;
  49 }
  50
  51 /* Append to growable string */
  52 void str_append(struct gstr *gs, const char *s)
  53 {
  54         size_t l;
  55         if (s) {
  56                 l = strlen(gs->s) + strlen(s) + 1;
  57                 if (l > gs->len) {
  58                         gs->s = xrealloc(gs->s, l);
  59                         gs->len = l;
  60                 }
  61                 strcat(gs->s, s);
  62         }
  63 }
  64
  65 /* Append printf formatted string to growable string */
  66 void str_printf(struct gstr *gs, const char *fmt, ...)
  67 {
  68         va_list ap;
  69         char s[10000]; /* big enough... */
  70         va_start(ap, fmt);
  71         vsnprintf(s, sizeof(s), fmt, ap);
  72         str_append(gs, s);
  73         va_end(ap);
  74 }
  75
  76 /* Retrieve value of growable string */
  77 char *str_get(struct gstr *gs)
  78 {
  79         return gs->s;
  80 }
  81
  82 void *xmalloc(size_t size)
  83 {
  84         void *p = malloc(size);
  85         if (p)
  86                 return p;
  87         fprintf(stderr, "Out of memory.\n");
  88         exit(1);
  89 }
  90
  91 void *xcalloc(size_t nmemb, size_t size)
  92 {
  93         void *p = calloc(nmemb, size);
  94         if (p)
  95                 return p;
  96         fprintf(stderr, "Out of memory.\n");
  97         exit(1);
  98 }
  99
 100 void *xrealloc(void *p, size_t size)
 101 {
 102         p = realloc(p, size);
 103         if (p)
 104                 return p;
 105         fprintf(stderr, "Out of memory.\n");
 106         exit(1);
 107 }
 108
 109 char *xstrdup(const char *s)
 110 {
 111         char *p;
 112
 113         p = strdup(s);
 114         if (p)
 115                 return p;
 116         fprintf(stderr, "Out of memory.\n");
 117         exit(1);
 118 }
 119
 120 char *xstrndup(const char *s, size_t n)
 121 {
 122         char *p;
 123
 124         p = strndup(s, n);
 125         if (p)
 126                 return p;
 127         fprintf(stderr, "Out of memory.\n");
 128         exit(1);
 129 }