+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0
-//
-// Copyright (C) 2018 Masahiro Yamada <yamada.masahiro@socionext.com>
-
-#include <ctype.h>
-#include <stdarg.h>
-#include <stdbool.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-#include "list.h"
-#include "lkc.h"
-
-#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
-
-static char *expand_string_with_args(const char *in, int argc, char *argv[]);
-static char *expand_string(const char *in);
-
-static void __attribute__((noreturn)) pperror(const char *format, ...)
-{
- va_list ap;
-
- fprintf(stderr, "%s:%d: ", current_file->name, yylineno);
- va_start(ap, format);
- vfprintf(stderr, format, ap);
- va_end(ap);
- fprintf(stderr, "\n");
-
- exit(1);
-}
-
-/*
- * Environment variables
- */
-static LIST_HEAD(env_list);
-
-struct env {
- char *name;
- char *value;
- struct list_head node;
-};
-
-static void env_add(const char *name, const char *value)
-{
- struct env *e;
-
- e = xmalloc(sizeof(*e));
- e->name = xstrdup(name);
- e->value = xstrdup(value);
-
- list_add_tail(&e->node, &env_list);
-}
-
-static void env_del(struct env *e)
-{
- list_del(&e->node);
- free(e->name);
- free(e->value);
- free(e);
-}
-
-/* The returned pointer must be freed when done */
-static char *env_expand(const char *name)
-{
- struct env *e;
- const char *value;
-
- if (!*name)
- return NULL;
-
- list_for_each_entry(e, &env_list, node) {
- if (!strcmp(name, e->name))
- return xstrdup(e->value);
- }
-
- value = getenv(name);
- if (!value)
- return NULL;
-
- /*
- * We need to remember all referenced environment variables.
- * They will be written out to include/config/auto.conf.cmd
- */
- env_add(name, value);
-
- return xstrdup(value);
-}
-
-void env_write_dep(FILE *f, const char *autoconfig_name)
-{
- struct env *e, *tmp;
-
- list_for_each_entry_safe(e, tmp, &env_list, node) {
- fprintf(f, "ifneq \"$(%s)\" \"%s\"\n", e->name, e->value);
- fprintf(f, "%s: FORCE\n", autoconfig_name);
- fprintf(f, "endif\n");
- env_del(e);
- }
-}
-
-/*
- * Built-in functions
- */
-struct function {
- const char *name;
- unsigned int min_args;
- unsigned int max_args;
- char *(*func)(int argc, char *argv[]);
-};
-
-static char *do_error_if(int argc, char *argv[])
-{
- if (!strcmp(argv[0], "y"))
- pperror("%s", argv[1]);
-
- return NULL;
-}
-
-static char *do_filename(int argc, char *argv[])
-{
- return xstrdup(current_file->name);
-}
-
-static char *do_info(int argc, char *argv[])
-{
- printf("%s\n", argv[0]);
-
- return xstrdup("");
-}
-
-static char *do_lineno(int argc, char *argv[])
-{
- char buf[16];
-
- sprintf(buf, "%d", yylineno);
-
- return xstrdup(buf);
-}
-
-static char *do_shell(int argc, char *argv[])
-{
- FILE *p;
- char buf[256];
- char *cmd;
- size_t nread;
- int i;
-
- cmd = argv[0];
-
- p = popen(cmd, "r");
- if (!p) {
- perror(cmd);
- exit(1);
- }
-
- nread = fread(buf, 1, sizeof(buf), p);
- if (nread == sizeof(buf))
- nread--;
-
- /* remove trailing new lines */
- while (nread > 0 && buf[nread - 1] == '\n')
- nread--;
-
- buf[nread] = 0;
-
- /* replace a new line with a space */
- for (i = 0; i < nread; i++) {
- if (buf[i] == '\n')
- buf[i] = ' ';
- }
-
- if (pclose(p) == -1) {
- perror(cmd);
- exit(1);
- }
-
- return xstrdup(buf);
-}
-
-static char *do_warning_if(int argc, char *argv[])
-{
- if (!strcmp(argv[0], "y"))
- fprintf(stderr, "%s:%d: %s\n",
- current_file->name, yylineno, argv[1]);
-
- return xstrdup("");
-}
-
-static const struct function function_table[] = {
- /* Name MIN MAX Function */
- { "error-if", 2, 2, do_error_if },
- { "filename", 0, 0, do_filename },
- { "info", 1, 1, do_info },
- { "lineno", 0, 0, do_lineno },
- { "shell", 1, 1, do_shell },
- { "warning-if", 2, 2, do_warning_if },
-};
-
-#define FUNCTION_MAX_ARGS 16
-
-static char *function_expand(const char *name, int argc, char *argv[])
-{
- const struct function *f;
- int i;
-
- for (i = 0; i < ARRAY_SIZE(function_table); i++) {
- f = &function_table[i];
- if (strcmp(f->name, name))
- continue;
-
- if (argc < f->min_args)
- pperror("too few function arguments passed to '%s'",
- name);
-
- if (argc > f->max_args)
- pperror("too many function arguments passed to '%s'",
- name);
-
- return f->func(argc, argv);
- }
-
- return NULL;
-}
-
-/*
- * Variables (and user-defined functions)
- */
-static LIST_HEAD(variable_list);
-
-struct variable {
- char *name;
- char *value;
- enum variable_flavor flavor;
- int exp_count;
- struct list_head node;
-};
-
-static struct variable *variable_lookup(const char *name)
-{
- struct variable *v;
-
- list_for_each_entry(v, &variable_list, node) {
- if (!strcmp(name, v->name))
- return v;
- }
-
- return NULL;
-}
-
-static char *variable_expand(const char *name, int argc, char *argv[])
-{
- struct variable *v;
- char *res;
-
- v = variable_lookup(name);
- if (!v)
- return NULL;
-
- if (argc == 0 && v->exp_count)
- pperror("Recursive variable '%s' references itself (eventually)",
- name);
-
- if (v->exp_count > 1000)
- pperror("Too deep recursive expansion");
-
- v->exp_count++;
-
- if (v->flavor == VAR_RECURSIVE)
- res = expand_string_with_args(v->value, argc, argv);
- else
- res = xstrdup(v->value);
-
- v->exp_count--;
-
- return res;
-}
-
-void variable_add(const char *name, const char *value,
- enum variable_flavor flavor)
-{
- struct variable *v;
- char *new_value;
- bool append = false;
-
- v = variable_lookup(name);
- if (v) {
- /* For defined variables, += inherits the existing flavor */
- if (flavor == VAR_APPEND) {
- flavor = v->flavor;
- append = true;
- } else {
- free(v->value);
- }
- } else {
- /* For undefined variables, += assumes the recursive flavor */
- if (flavor == VAR_APPEND)
- flavor = VAR_RECURSIVE;
-
- v = xmalloc(sizeof(*v));
- v->name = xstrdup(name);
- v->exp_count = 0;
- list_add_tail(&v->node, &variable_list);
- }
-
- v->flavor = flavor;
-
- if (flavor == VAR_SIMPLE)
- new_value = expand_string(value);
- else
- new_value = xstrdup(value);
-
- if (append) {
- v->value = xrealloc(v->value,
- strlen(v->value) + strlen(new_value) + 2);
- strcat(v->value, " ");
- strcat(v->value, new_value);
- free(new_value);
- } else {
- v->value = new_value;
- }
-}
-
-static void variable_del(struct variable *v)
-{
- list_del(&v->node);
- free(v->name);
- free(v->value);
- free(v);
-}
-
-void variable_all_del(void)
-{
- struct variable *v, *tmp;
-
- list_for_each_entry_safe(v, tmp, &variable_list, node)
- variable_del(v);
-}
-
-/*
- * Evaluate a clause with arguments. argc/argv are arguments from the upper
- * function call.
- *
- * Returned string must be freed when done
- */
-static char *eval_clause(const char *str, size_t len, int argc, char *argv[])
-{
- char *tmp, *name, *res, *endptr, *prev, *p;
- int new_argc = 0;
- char *new_argv[FUNCTION_MAX_ARGS];
- int nest = 0;
- int i;
- unsigned long n;
-
- tmp = xstrndup(str, len);
-
- /*
- * If variable name is '1', '2', etc. It is generally an argument
- * from a user-function call (i.e. local-scope variable). If not
- * available, then look-up global-scope variables.
- */
- n = strtoul(tmp, &endptr, 10);
- if (!*endptr && n > 0 && n <= argc) {
- res = xstrdup(argv[n - 1]);
- goto free_tmp;
- }
-
- prev = p = tmp;
-
- /*
- * Split into tokens
- * The function name and arguments are separated by a comma.
- * For example, if the function call is like this:
- * $(foo,$(x),$(y))
- *
- * The input string for this helper should be:
- * foo,$(x),$(y)
- *
- * and split into:
- * new_argv[0] = 'foo'
- * new_argv[1] = '$(x)'
- * new_argv[2] = '$(y)'
- */
- while (*p) {
- if (nest == 0 && *p == ',') {
- *p = 0;
- if (new_argc >= FUNCTION_MAX_ARGS)
- pperror("too many function arguments");
- new_argv[new_argc++] = prev;
- prev = p + 1;
- } else if (*p == '(') {
- nest++;
- } else if (*p == ')') {
- nest--;
- }
-
- p++;
- }
- new_argv[new_argc++] = prev;
-
- /*
- * Shift arguments
- * new_argv[0] represents a function name or a variable name. Put it
- * into 'name', then shift the rest of the arguments. This simplifies
- * 'const' handling.
- */
- name = expand_string_with_args(new_argv[0], argc, argv);
- new_argc--;
- for (i = 0; i < new_argc; i++)
- new_argv[i] = expand_string_with_args(new_argv[i + 1],
- argc, argv);
-
- /* Search for variables */
- res = variable_expand(name, new_argc, new_argv);
- if (res)
- goto free;
-
- /* Look for built-in functions */
- res = function_expand(name, new_argc, new_argv);
- if (res)
- goto free;
-
- /* Last, try environment variable */
- if (new_argc == 0) {
- res = env_expand(name);
- if (res)
- goto free;
- }
-
- res = xstrdup("");
-free:
- for (i = 0; i < new_argc; i++)
- free(new_argv[i]);
- free(name);
-free_tmp:
- free(tmp);
-
- return res;
-}
-
-/*
- * Expand a string that follows '$'
- *
- * 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)
-{
- /* Why are '.' and '/' valid characters for symbols? */
- return !(isalnum(c) || c == '_' || 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);
-}
projects / openwrt / staging / luka.git / blobdiff