575 lines
11 KiB
C
575 lines
11 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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//
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// Copyright (C) 2018 Masahiro Yamada <yamada.masahiro@socionext.com>
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#include <ctype.h>
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#include <stdarg.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "list.h"
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#include "lkc.h"
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#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
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static char *expand_string_with_args(const char *in, int argc, char *argv[]);
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static char *expand_string(const char *in);
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static void __attribute__((noreturn)) pperror(const char *format, ...)
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{
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va_list ap;
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fprintf(stderr, "%s:%d: ", current_file->name, yylineno);
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va_start(ap, format);
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vfprintf(stderr, format, ap);
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va_end(ap);
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fprintf(stderr, "\n");
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exit(1);
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}
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/*
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* Environment variables
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*/
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static LIST_HEAD(env_list);
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struct env {
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char *name;
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char *value;
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struct list_head node;
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};
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static void env_add(const char *name, const char *value)
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{
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struct env *e;
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e = xmalloc(sizeof(*e));
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e->name = xstrdup(name);
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e->value = xstrdup(value);
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list_add_tail(&e->node, &env_list);
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}
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static void env_del(struct env *e)
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{
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list_del(&e->node);
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free(e->name);
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free(e->value);
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free(e);
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}
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/* The returned pointer must be freed when done */
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static char *env_expand(const char *name)
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{
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struct env *e;
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const char *value;
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if (!*name)
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return NULL;
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list_for_each_entry(e, &env_list, node) {
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if (!strcmp(name, e->name))
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return xstrdup(e->value);
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}
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value = getenv(name);
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if (!value)
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return NULL;
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/*
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* We need to remember all referenced environment variables.
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* They will be written out to include/config/auto.conf.cmd
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*/
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env_add(name, value);
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return xstrdup(value);
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}
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void env_write_dep(FILE *f, const char *autoconfig_name)
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{
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struct env *e, *tmp;
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list_for_each_entry_safe(e, tmp, &env_list, node) {
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fprintf(f, "ifneq \"$(%s)\" \"%s\"\n", e->name, e->value);
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fprintf(f, "%s: FORCE\n", autoconfig_name);
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fprintf(f, "endif\n");
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env_del(e);
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}
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}
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/*
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* Built-in functions
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*/
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struct function {
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const char *name;
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unsigned int min_args;
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unsigned int max_args;
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char *(*func)(int argc, char *argv[]);
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};
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static char *do_error_if(int argc, char *argv[])
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{
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if (!strcmp(argv[0], "y"))
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pperror("%s", argv[1]);
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return xstrdup("");
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}
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static char *do_filename(int argc, char *argv[])
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{
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return xstrdup(current_file->name);
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}
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static char *do_info(int argc, char *argv[])
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{
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printf("%s\n", argv[0]);
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return xstrdup("");
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}
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static char *do_lineno(int argc, char *argv[])
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{
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char buf[16];
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sprintf(buf, "%d", yylineno);
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return xstrdup(buf);
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}
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static char *do_shell(int argc, char *argv[])
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{
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FILE *p;
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char buf[4096];
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char *cmd;
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size_t nread;
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int i;
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cmd = argv[0];
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p = popen(cmd, "r");
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if (!p) {
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perror(cmd);
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exit(1);
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}
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nread = fread(buf, 1, sizeof(buf), p);
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if (nread == sizeof(buf))
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nread--;
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/* remove trailing new lines */
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while (nread > 0 && buf[nread - 1] == '\n')
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nread--;
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buf[nread] = 0;
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/* replace a new line with a space */
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for (i = 0; i < nread; i++) {
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if (buf[i] == '\n')
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buf[i] = ' ';
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}
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if (pclose(p) == -1) {
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perror(cmd);
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exit(1);
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}
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return xstrdup(buf);
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}
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static char *do_warning_if(int argc, char *argv[])
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{
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if (!strcmp(argv[0], "y"))
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fprintf(stderr, "%s:%d: %s\n",
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current_file->name, yylineno, argv[1]);
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return xstrdup("");
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}
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static const struct function function_table[] = {
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/* Name MIN MAX Function */
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{ "error-if", 2, 2, do_error_if },
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{ "filename", 0, 0, do_filename },
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{ "info", 1, 1, do_info },
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{ "lineno", 0, 0, do_lineno },
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{ "shell", 1, 1, do_shell },
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{ "warning-if", 2, 2, do_warning_if },
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};
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#define FUNCTION_MAX_ARGS 16
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static char *function_expand(const char *name, int argc, char *argv[])
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{
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const struct function *f;
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int i;
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for (i = 0; i < ARRAY_SIZE(function_table); i++) {
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f = &function_table[i];
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if (strcmp(f->name, name))
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continue;
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if (argc < f->min_args)
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pperror("too few function arguments passed to '%s'",
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name);
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if (argc > f->max_args)
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pperror("too many function arguments passed to '%s'",
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name);
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return f->func(argc, argv);
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}
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return NULL;
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}
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/*
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* Variables (and user-defined functions)
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*/
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static LIST_HEAD(variable_list);
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struct variable {
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char *name;
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char *value;
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enum variable_flavor flavor;
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int exp_count;
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struct list_head node;
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};
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static struct variable *variable_lookup(const char *name)
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{
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struct variable *v;
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list_for_each_entry(v, &variable_list, node) {
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if (!strcmp(name, v->name))
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return v;
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}
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return NULL;
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}
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static char *variable_expand(const char *name, int argc, char *argv[])
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{
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struct variable *v;
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char *res;
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v = variable_lookup(name);
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if (!v)
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return NULL;
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if (argc == 0 && v->exp_count)
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pperror("Recursive variable '%s' references itself (eventually)",
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name);
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if (v->exp_count > 1000)
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pperror("Too deep recursive expansion");
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v->exp_count++;
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if (v->flavor == VAR_RECURSIVE)
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res = expand_string_with_args(v->value, argc, argv);
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else
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res = xstrdup(v->value);
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v->exp_count--;
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return res;
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}
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void variable_add(const char *name, const char *value,
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enum variable_flavor flavor)
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{
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struct variable *v;
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char *new_value;
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bool append = false;
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v = variable_lookup(name);
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if (v) {
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/* For defined variables, += inherits the existing flavor */
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if (flavor == VAR_APPEND) {
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flavor = v->flavor;
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append = true;
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} else {
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free(v->value);
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}
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} else {
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/* For undefined variables, += assumes the recursive flavor */
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if (flavor == VAR_APPEND)
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flavor = VAR_RECURSIVE;
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v = xmalloc(sizeof(*v));
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v->name = xstrdup(name);
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v->exp_count = 0;
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list_add_tail(&v->node, &variable_list);
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}
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v->flavor = flavor;
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if (flavor == VAR_SIMPLE)
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new_value = expand_string(value);
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else
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new_value = xstrdup(value);
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if (append) {
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v->value = xrealloc(v->value,
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strlen(v->value) + strlen(new_value) + 2);
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strcat(v->value, " ");
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strcat(v->value, new_value);
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free(new_value);
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} else {
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v->value = new_value;
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}
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}
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static void variable_del(struct variable *v)
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{
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list_del(&v->node);
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free(v->name);
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free(v->value);
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free(v);
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}
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void variable_all_del(void)
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{
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struct variable *v, *tmp;
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list_for_each_entry_safe(v, tmp, &variable_list, node)
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variable_del(v);
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}
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/*
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* Evaluate a clause with arguments. argc/argv are arguments from the upper
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* function call.
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*
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* Returned string must be freed when done
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*/
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static char *eval_clause(const char *str, size_t len, int argc, char *argv[])
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{
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char *tmp, *name, *res, *endptr, *prev, *p;
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int new_argc = 0;
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char *new_argv[FUNCTION_MAX_ARGS];
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int nest = 0;
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int i;
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unsigned long n;
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tmp = xstrndup(str, len);
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/*
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* If variable name is '1', '2', etc. It is generally an argument
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* from a user-function call (i.e. local-scope variable). If not
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* available, then look-up global-scope variables.
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*/
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n = strtoul(tmp, &endptr, 10);
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if (!*endptr && n > 0 && n <= argc) {
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res = xstrdup(argv[n - 1]);
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goto free_tmp;
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}
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prev = p = tmp;
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/*
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* Split into tokens
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* The function name and arguments are separated by a comma.
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* For example, if the function call is like this:
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* $(foo,$(x),$(y))
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*
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* The input string for this helper should be:
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* foo,$(x),$(y)
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*
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* and split into:
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* new_argv[0] = 'foo'
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* new_argv[1] = '$(x)'
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* new_argv[2] = '$(y)'
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*/
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while (*p) {
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if (nest == 0 && *p == ',') {
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*p = 0;
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if (new_argc >= FUNCTION_MAX_ARGS)
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pperror("too many function arguments");
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new_argv[new_argc++] = prev;
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prev = p + 1;
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} else if (*p == '(') {
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nest++;
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} else if (*p == ')') {
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nest--;
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}
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p++;
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}
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new_argv[new_argc++] = prev;
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/*
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* Shift arguments
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* new_argv[0] represents a function name or a variable name. Put it
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* into 'name', then shift the rest of the arguments. This simplifies
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* 'const' handling.
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*/
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name = expand_string_with_args(new_argv[0], argc, argv);
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new_argc--;
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for (i = 0; i < new_argc; i++)
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new_argv[i] = expand_string_with_args(new_argv[i + 1],
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argc, argv);
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/* Search for variables */
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res = variable_expand(name, new_argc, new_argv);
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|
|
if (res)
|
||
|
|
goto free;
|
||
|
|
|
||
|
|
/* Look for built-in functions */
|
||
|
|
res = function_expand(name, new_argc, new_argv);
|
||
|
|
if (res)
|
||
|
|
goto free;
|
||
|
|
|
||
|
|
/* Last, try environment variable */
|
||
|
|
if (new_argc == 0) {
|
||
|
|
res = env_expand(name);
|
||
|
|
if (res)
|
||
|
|
goto free;
|
||
|
|
}
|
||
|
|
|
||
|
|
res = xstrdup("");
|
||
|
|
free:
|
||
|
|
for (i = 0; i < new_argc; i++)
|
||
|
|
free(new_argv[i]);
|
||
|
|
free(name);
|
||
|
|
free_tmp:
|
||
|
|
free(tmp);
|
||
|
|
|
||
|
|
return res;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Expand a string that follows '$'
|
||
|
|
*
|
||
|
|
* For example, if the input string is
|
||
|
|
* ($(FOO)$($(BAR)))$(BAZ)
|
||
|
|
* this helper evaluates
|
||
|
|
* $($(FOO)$($(BAR)))
|
||
|
|
* and returns a new string containing the expansion (note that the string is
|
||
|
|
* recursively expanded), also advancing 'str' to point to the next character
|
||
|
|
* after the corresponding closing parenthesis, in this case, *str will be
|
||
|
|
* $(BAR)
|
||
|
|
*/
|
||
|
|
static char *expand_dollar_with_args(const char **str, int argc, char *argv[])
|
||
|
|
{
|
||
|
|
const char *p = *str;
|
||
|
|
const char *q;
|
||
|
|
int nest = 0;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* In Kconfig, variable/function references always start with "$(".
|
||
|
|
* Neither single-letter variables as in $A nor curly braces as in ${CC}
|
||
|
|
* are supported. '$' not followed by '(' loses its special meaning.
|
||
|
|
*/
|
||
|
|
if (*p != '(') {
|
||
|
|
*str = p;
|
||
|
|
return xstrdup("$");
|
||
|
|
}
|
||
|
|
|
||
|
|
p++;
|
||
|
|
q = p;
|
||
|
|
while (*q) {
|
||
|
|
if (*q == '(') {
|
||
|
|
nest++;
|
||
|
|
} else if (*q == ')') {
|
||
|
|
if (nest-- == 0)
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
q++;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (!*q)
|
||
|
|
pperror("unterminated reference to '%s': missing ')'", p);
|
||
|
|
|
||
|
|
/* Advance 'str' to after the expanded initial portion of the string */
|
||
|
|
*str = q + 1;
|
||
|
|
|
||
|
|
return eval_clause(p, q - p, argc, argv);
|
||
|
|
}
|
||
|
|
|
||
|
|
char *expand_dollar(const char **str)
|
||
|
|
{
|
||
|
|
return expand_dollar_with_args(str, 0, NULL);
|
||
|
|
}
|
||
|
|
|
||
|
|
static char *__expand_string(const char **str, bool (*is_end)(char c),
|
||
|
|
int argc, char *argv[])
|
||
|
|
{
|
||
|
|
const char *in, *p;
|
||
|
|
char *expansion, *out;
|
||
|
|
size_t in_len, out_len;
|
||
|
|
|
||
|
|
out = xmalloc(1);
|
||
|
|
*out = 0;
|
||
|
|
out_len = 1;
|
||
|
|
|
||
|
|
p = in = *str;
|
||
|
|
|
||
|
|
while (1) {
|
||
|
|
if (*p == '$') {
|
||
|
|
in_len = p - in;
|
||
|
|
p++;
|
||
|
|
expansion = expand_dollar_with_args(&p, argc, argv);
|
||
|
|
out_len += in_len + strlen(expansion);
|
||
|
|
out = xrealloc(out, out_len);
|
||
|
|
strncat(out, in, in_len);
|
||
|
|
strcat(out, expansion);
|
||
|
|
free(expansion);
|
||
|
|
in = p;
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (is_end(*p))
|
||
|
|
break;
|
||
|
|
|
||
|
|
p++;
|
||
|
|
}
|
||
|
|
|
||
|
|
in_len = p - in;
|
||
|
|
out_len += in_len;
|
||
|
|
out = xrealloc(out, out_len);
|
||
|
|
strncat(out, in, in_len);
|
||
|
|
|
||
|
|
/* Advance 'str' to the end character */
|
||
|
|
*str = p;
|
||
|
|
|
||
|
|
return out;
|
||
|
|
}
|
||
|
|
|
||
|
|
static bool is_end_of_str(char c)
|
||
|
|
{
|
||
|
|
return !c;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Expand variables and functions in the given string. Undefined variables
|
||
|
|
* expand to an empty string.
|
||
|
|
* The returned string must be freed when done.
|
||
|
|
*/
|
||
|
|
static char *expand_string_with_args(const char *in, int argc, char *argv[])
|
||
|
|
{
|
||
|
|
return __expand_string(&in, is_end_of_str, argc, argv);
|
||
|
|
}
|
||
|
|
|
||
|
|
static char *expand_string(const char *in)
|
||
|
|
{
|
||
|
|
return expand_string_with_args(in, 0, NULL);
|
||
|
|
}
|
||
|
|
|
||
|
|
static bool is_end_of_token(char c)
|
||
|
|
{
|
||
|
|
return !(isalnum(c) || c == '_' || c == '-');
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Expand variables in a token. The parsing stops when a token separater
|
||
|
|
* (in most cases, it is a whitespace) is encountered. 'str' is updated to
|
||
|
|
* point to the next character.
|
||
|
|
*
|
||
|
|
* The returned string must be freed when done.
|
||
|
|
*/
|
||
|
|
char *expand_one_token(const char **str)
|
||
|
|
{
|
||
|
|
return __expand_string(str, is_end_of_token, 0, NULL);
|
||
|
|
}
|