scripts/config/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 /* Allocate initial growable sting */
  30 struct gstr str_new(void)
  31 {
  32         struct gstr gs;
  33         gs.s = malloc(sizeof(char) * 64);
  34         gs.len = 16;
  35         strcpy(gs.s, "\0");
  36         return gs;
  37 }
  38
  39 /* Allocate and assign growable string */
  40 struct gstr str_assign(const char *s)
  41 {
  42         struct gstr gs;
  43         gs.s = strdup(s);
  44         gs.len = strlen(s) + 1;
  45         return gs;
  46 }
  47
  48 /* Free storage for growable string */
  49 void str_free(struct gstr *gs)
  50 {
  51         if (gs->s)
  52                 free(gs->s);
  53         gs->s = NULL;
  54         gs->len = 0;
  55 }
  56
  57 /* Append to growable string */
  58 void str_append(struct gstr *gs, const char *s)
  59 {
  60         size_t l = strlen(gs->s) + strlen(s) + 1;
  61         if (l > gs->len) {
  62                 gs->s   = realloc(gs->s, l);
  63                 gs->len = l;
  64         }
  65         strcat(gs->s, s);
  66 }
  67
  68 /* Append printf formatted string to growable string */
  69 void str_printf(struct gstr *gs, const char *fmt, ...)
  70 {
  71         va_list ap;
  72         char s[10000]; /* big enough... */
  73         va_start(ap, fmt);
  74         vsnprintf(s, sizeof(s), fmt, ap);
  75         str_append(gs, s);
  76         va_end(ap);
  77 }
  78
  79 /* Retrieve value of growable string */
  80 const char *str_get(struct gstr *gs)
  81 {
  82         return gs->s;
  83 }
  84