root/scripts/kconfig/util.c

DEFINITIONS

1. file_lookup
2. file_write_dep
3. str_new
4. str_assign
5. str_free
6. str_append
7. str_printf
8. str_get
9. xmalloc
10. xcalloc

/*
 * Copyright (C) 2002-2005 Roman Zippel <zippel@linux-m68k.org>
 * Copyright (C) 2002-2005 Sam Ravnborg <sam@ravnborg.org>
 *
 * Released under the terms of the GNU GPL v2.0.
 */

#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include "lkc.h"

/* file already present in list? If not add it */
struct file *file_lookup(const char *name)
{
        struct file *file;
        const char *file_name = sym_expand_string_value(name);

        for (file = file_list; file; file = file->next) {
                if (!strcmp(name, file->name)) {
                        free((void *)file_name);
                        return file;
                }
        }

        file = xmalloc(sizeof(*file));
        memset(file, 0, sizeof(*file));
        file->name = file_name;
        file->next = file_list;
        file_list = file;
        return file;
}

/* write a dependency file as used by kbuild to track dependencies */
int file_write_dep(const char *name)
{
        struct symbol *sym, *env_sym;
        struct expr *e;
        struct file *file;
        FILE *out;

        if (!name)
                name = ".kconfig.d";
        out = fopen("..config.tmp", "w");
        if (!out)
                return 1;
        fprintf(out, "deps_config := \\\n");
        for (file = file_list; file; file = file->next) {
                if (file->next)
                        fprintf(out, "\t%s \\\n", file->name);
                else
                        fprintf(out, "\t%s\n", file->name);
        }
        fprintf(out, "\n%s: \\\n"
                     "\t$(deps_config)\n\n", conf_get_autoconfig_name());

        expr_list_for_each_sym(sym_env_list, e, sym) {
                struct property *prop;
                const char *value;

                prop = sym_get_env_prop(sym);
                env_sym = prop_get_symbol(prop);
                if (!env_sym)
                        continue;
                value = getenv(env_sym->name);
                if (!value)
                        value = "";
                fprintf(out, "ifneq \"$(%s)\" \"%s\"\n", env_sym->name, value);
                fprintf(out, "%s: FORCE\n", conf_get_autoconfig_name());
                fprintf(out, "endif\n");
        }

        fprintf(out, "\n$(deps_config): ;\n");
        fclose(out);
        rename("..config.tmp", name);
        return 0;
}


/* Allocate initial growable string */
struct gstr str_new(void)
{
        struct gstr gs;
        gs.s = xmalloc(sizeof(char) * 64);
        gs.len = 64;
        gs.max_width = 0;
        strcpy(gs.s, "\0");
        return gs;
}

/* Allocate and assign growable string */
struct gstr str_assign(const char *s)
{
        struct gstr gs;
        gs.s = strdup(s);
        gs.len = strlen(s) + 1;
        gs.max_width = 0;
        return gs;
}

/* Free storage for growable string */
void str_free(struct gstr *gs)
{
        if (gs->s)
                free(gs->s);
        gs->s = NULL;
        gs->len = 0;
}

/* Append to growable string */
void str_append(struct gstr *gs, const char *s)
{
        size_t l;
        if (s) {
                l = strlen(gs->s) + strlen(s) + 1;
                if (l > gs->len) {
                        gs->s   = realloc(gs->s, l);
                        gs->len = l;
                }
                strcat(gs->s, s);
        }
}

/* Append printf formatted string to growable string */
void str_printf(struct gstr *gs, const char *fmt, ...)
{
        va_list ap;
        char s[10000]; /* big enough... */
        va_start(ap, fmt);
        vsnprintf(s, sizeof(s), fmt, ap);
        str_append(gs, s);
        va_end(ap);
}

/* Retrieve value of growable string */
const char *str_get(struct gstr *gs)
{
        return gs->s;
}

void *xmalloc(size_t size)
{
        void *p = malloc(size);
        if (p)
                return p;
        fprintf(stderr, "Out of memory.\n");
        exit(1);
}

void *xcalloc(size_t nmemb, size_t size)
{
        void *p = calloc(nmemb, size);
        if (p)
                return p;
        fprintf(stderr, "Out of memory.\n");
        exit(1);
}