diff options
Diffstat (limited to 'scripts/config/preprocess.c')
| -rw-r--r-- | scripts/config/preprocess.c | 575 |
1 files changed, 0 insertions, 575 deletions
diff --git a/scripts/config/preprocess.c b/scripts/config/preprocess.c deleted file mode 100644 index dcc07c45eb..0000000000 --- a/scripts/config/preprocess.c +++ /dev/null @@ -1,575 +0,0 @@ -// 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); -} |