LXR linux/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#include "lkc.h"
  11
  12/* file already present in list? If not add it */
  13struct 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 */
  32struct 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 */
  43void 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 */
  52void 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 */
  66void 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 */
  77const char *str_get(struct gstr *gs)
  78{
  79        return gs->s;
  80}
  81
  82void *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
  91void *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
 100void *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
 109char *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
 120char *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}
 130