linux/scripts/kconfig/util.c
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   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 */
  12struct 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/* write a dependency file as used by kbuild to track dependencies */
  30int file_write_dep(const char *name)
  31{
  32        struct symbol *sym, *env_sym;
  33        struct expr *e;
  34        struct file *file;
  35        FILE *out;
  36
  37        if (!name)
  38                name = ".kconfig.d";
  39        out = fopen("..config.tmp", "w");
  40        if (!out)
  41                return 1;
  42        fprintf(out, "deps_config := \\\n");
  43        for (file = file_list; file; file = file->next) {
  44                if (file->next)
  45                        fprintf(out, "\t%s \\\n", file->name);
  46                else
  47                        fprintf(out, "\t%s\n", file->name);
  48        }
  49        fprintf(out, "\ninclude/config/auto.conf: \\\n"
  50                     "\t$(deps_config)\n\n");
  51
  52        expr_list_for_each_sym(sym_env_list, e, sym) {
  53                struct property *prop;
  54                const char *value;
  55
  56                prop = sym_get_env_prop(sym);
  57                env_sym = prop_get_symbol(prop);
  58                if (!env_sym)
  59                        continue;
  60                value = getenv(env_sym->name);
  61                if (!value)
  62                        value = "";
  63                fprintf(out, "ifneq \"$(%s)\" \"%s\"\n", env_sym->name, value);
  64                fprintf(out, "include/config/auto.conf: FORCE\n");
  65                fprintf(out, "endif\n");
  66        }
  67
  68        fprintf(out, "\n$(deps_config): ;\n");
  69        fclose(out);
  70        rename("..config.tmp", name);
  71        return 0;
  72}
  73
  74
  75/* Allocate initial growable sting */
  76struct gstr str_new(void)
  77{
  78        struct gstr gs;
  79        gs.s = malloc(sizeof(char) * 64);
  80        gs.len = 64;
  81        strcpy(gs.s, "\0");
  82        return gs;
  83}
  84
  85/* Allocate and assign growable string */
  86struct gstr str_assign(const char *s)
  87{
  88        struct gstr gs;
  89        gs.s = strdup(s);
  90        gs.len = strlen(s) + 1;
  91        return gs;
  92}
  93
  94/* Free storage for growable string */
  95void str_free(struct gstr *gs)
  96{
  97        if (gs->s)
  98                free(gs->s);
  99        gs->s = NULL;
 100        gs->len = 0;
 101}
 102
 103/* Append to growable string */
 104void str_append(struct gstr *gs, const char *s)
 105{
 106        size_t l;
 107        if (s) {
 108                l = strlen(gs->s) + strlen(s) + 1;
 109                if (l > gs->len) {
 110                        gs->s   = realloc(gs->s, l);
 111                        gs->len = l;
 112                }
 113                strcat(gs->s, s);
 114        }
 115}
 116
 117/* Append printf formatted string to growable string */
 118void str_printf(struct gstr *gs, const char *fmt, ...)
 119{
 120        va_list ap;
 121        char s[10000]; /* big enough... */
 122        va_start(ap, fmt);
 123        vsnprintf(s, sizeof(s), fmt, ap);
 124        str_append(gs, s);
 125        va_end(ap);
 126}
 127
 128/* Retrieve value of growable string */
 129const char *str_get(struct gstr *gs)
 130{
 131        return gs->s;
 132}
 133
 134