// SPDX-License-Identifier: GPL-2.0-only /* * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org> */ #include <sys/mman.h> #include <sys/stat.h> #include <sys/types.h> #include <ctype.h> #include <errno.h> #include <fcntl.h> #include <limits.h> #include <stdarg.h> #include <stdbool.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <time.h> #include <unistd.h> #include "lkc.h" /* return true if 'path' exists, false otherwise */ static bool is_present(const char *path) { struct stat st; return !stat(path, &st); } /* return true if 'path' exists and it is a directory, false otherwise */ static bool is_dir(const char *path) { struct stat st; if (stat(path, &st)) return false; return S_ISDIR(st.st_mode); } /* return true if the given two files are the same, false otherwise */ static bool is_same(const char *file1, const char *file2) { int fd1, fd2; struct stat st1, st2; void *map1, *map2; bool ret = false; fd1 = open(file1, O_RDONLY); if (fd1 < 0) return ret; fd2 = open(file2, O_RDONLY); if (fd2 < 0) goto close1; ret = fstat(fd1, &st1); if (ret) goto close2; ret = fstat(fd2, &st2); if (ret) goto close2; if (st1.st_size != st2.st_size) goto close2; map1 = mmap(NULL, st1.st_size, PROT_READ, MAP_PRIVATE, fd1, 0); if (map1 == MAP_FAILED) goto close2; map2 = mmap(NULL, st2.st_size, PROT_READ, MAP_PRIVATE, fd2, 0); if (map2 == MAP_FAILED) goto close2; if (bcmp(map1, map2, st1.st_size)) goto close2; ret = true; close2: close(fd2); close1: close(fd1); return ret; } /* * Create the parent directory of the given path. * * For example, if 'include/config/auto.conf' is given, create 'include/config'. */ static int make_parent_dir(const char *path) { char tmp[PATH_MAX + 1]; char *p; strncpy(tmp, path, sizeof(tmp)); tmp[sizeof(tmp) - 1] = 0; /* Remove the base name. Just return if nothing is left */ p = strrchr(tmp, '/'); if (!p) return 0; *(p + 1) = 0; /* Just in case it is an absolute path */ p = tmp; while (*p == '/') p++; while ((p = strchr(p, '/'))) { *p = 0; /* skip if the directory exists */ if (!is_dir(tmp) && mkdir(tmp, 0755)) return -1; *p = '/'; while (*p == '/') p++; } return 0; } static char depfile_path[PATH_MAX]; static size_t depfile_prefix_len; /* touch depfile for symbol 'name' */ static int conf_touch_dep(const char *name) { int fd; /* check overflow: prefix + name + '\0' must fit in buffer. */ if (depfile_prefix_len + strlen(name) + 1 > sizeof(depfile_path)) return -1; strcpy(depfile_path + depfile_prefix_len, name); fd = open(depfile_path, O_WRONLY | O_CREAT | O_TRUNC, 0644); if (fd == -1) return -1; close(fd); return 0; } static void conf_warning(const char *fmt, ...) __attribute__ ((format (printf, 1, 2))); static void conf_message(const char *fmt, ...) __attribute__ ((format (printf, 1, 2))); static const char *conf_filename; static int conf_lineno, conf_warnings; #ifdef __MINGW32__ #define mkdir(_n,_p) mkdir((_n)) #endif static void conf_warning(const char *fmt, ...) { va_list ap; va_start(ap, fmt); fprintf(stderr, "%s:%d:warning: ", conf_filename, conf_lineno); vfprintf(stderr, fmt, ap); fprintf(stderr, "\n"); va_end(ap); conf_warnings++; } static void conf_notice(const char *fmt, ...) { va_list ap; va_start(ap, fmt); fprintf(stderr, "%s:%d:notice: ", conf_filename, conf_lineno); vfprintf(stderr, fmt, ap); fprintf(stderr, "\n"); va_end(ap); } static void conf_default_message_callback(const char *s) { printf("#\n# "); printf("%s", s); printf("\n#\n"); } static void (*conf_message_callback)(const char *s) = conf_default_message_callback; void conf_set_message_callback(void (*fn)(const char *s)) { conf_message_callback = fn; } static void conf_message(const char *fmt, ...) { va_list ap; char buf[4096]; if (!conf_message_callback) return; va_start(ap, fmt); vsnprintf(buf, sizeof(buf), fmt, ap); conf_message_callback(buf); va_end(ap); } const char *conf_get_configname(void) { char *name = getenv("KCONFIG_CONFIG"); return name ? name : ".config"; } static const char *conf_get_autoconfig_name(void) { char *name = getenv("KCONFIG_AUTOCONFIG"); return name ? name : "include/config/auto.conf"; } static const char *conf_get_autoheader_name(void) { char *name = getenv("KCONFIG_AUTOHEADER"); return name ? name : "include/generated/autoconf.h"; } static const char *conf_get_rustccfg_name(void) { char *name = getenv("KCONFIG_RUSTCCFG"); return name ? name : "include/generated/rustc_cfg"; } static const char *conf_get_autobase_name(void) { char *name = getenv("KCONFIG_SPLITCONFIG"); return name ? name : "include/config/"; } static int conf_set_sym_val(struct symbol *sym, int def, int def_flags, char *p) { char *p2; switch (sym->type) { case S_TRISTATE: if (p[0] == 'm') { sym->def[def].tri = mod; sym->flags |= def_flags; break; } /* fall through */ case S_BOOLEAN: if (p[0] == 'y') { sym->def[def].tri = yes; sym->flags |= def_flags; break; } if (p[0] == 'n') { sym->def[def].tri = no; sym->flags |= def_flags; break; } if (def != S_DEF_AUTO) conf_warning("symbol value '%s' invalid for %s", p, sym->name); return 1; case S_STRING: /* No escaping for S_DEF_AUTO (include/config/auto.conf) */ if (def != S_DEF_AUTO) { if (*p++ != '"') break; for (p2 = p; (p2 = strpbrk(p2, "\"\\")); p2++) { if (*p2 == '"') { *p2 = 0; break; } memmove(p2, p2 + 1, strlen(p2)); } if (!p2) { conf_warning("invalid string found"); return 1; } } /* fall through */ case S_INT: case S_HEX: if (sym_string_valid(sym, p)) { sym->def[def].val = xstrdup(p); sym->flags |= def_flags; } else { if (def != S_DEF_AUTO) conf_warning("symbol value '%s' invalid for %s", p, sym->name); return 1; } break; default: ; } return 0; } #define LINE_GROWTH 16 static int add_byte(int c, char **lineptr, size_t slen, size_t *n) { char *nline; size_t new_size = slen + 1; if (new_size > *n) { new_size += LINE_GROWTH - 1; new_size *= 2; nline = xrealloc(*lineptr, new_size); if (!nline) return -1; *lineptr = nline; *n = new_size; } (*lineptr)[slen] = c; return 0; } static ssize_t compat_getline(char **lineptr, size_t *n, FILE *stream) { char *line = *lineptr; size_t slen = 0; for (;;) { int c = getc(stream); switch (c) { case '\n': if (add_byte(c, &line, slen, n) < 0) goto e_out; slen++; /* fall through */ case EOF: if (add_byte('\0', &line, slen, n) < 0) goto e_out; *lineptr = line; if (slen == 0) return -1; return slen; default: if (add_byte(c, &line, slen, n) < 0) goto e_out; slen++; } } e_out: line[slen-1] = '\0'; *lineptr = line; return -1; } int conf_read_simple(const char *name, int def) { FILE *in = NULL; char *line = NULL; size_t line_asize = 0; char *p, *p2; struct symbol *sym; int i, def_flags; const char *warn_unknown; const char *werror; warn_unknown = getenv("KCONFIG_WARN_UNKNOWN_SYMBOLS"); werror = getenv("KCONFIG_WERROR"); if (name) { in = zconf_fopen(name); } else { char *env; name = conf_get_configname(); in = zconf_fopen(name); if (in) goto load; conf_set_changed(true); env = getenv("KCONFIG_DEFCONFIG_LIST"); if (!env) return 1; while (1) { bool is_last; while (isspace(*env)) env++; if (!*env) break; p = env; while (*p && !isspace(*p)) p++; is_last = (*p == '\0'); *p = '\0'; in = zconf_fopen(env); if (in) { conf_message("using defaults found in %s", env); goto load; } if (is_last) break; env = p + 1; } } if (!in) return 1; load: conf_filename = name; conf_lineno = 0; conf_warnings = 0; def_flags = SYMBOL_DEF << def; for_all_symbols(i, sym) { sym->flags |= SYMBOL_CHANGED; sym->flags &= ~(def_flags|SYMBOL_VALID); if (sym_is_choice(sym)) sym->flags |= def_flags; switch (sym->type) { case S_INT: case S_HEX: case S_STRING: if (sym->def[def].val) free(sym->def[def].val); /* fall through */ default: sym->def[def].val = NULL; sym->def[def].tri = no; } } while (compat_getline(&line, &line_asize, in) != -1) { conf_lineno++; sym = NULL; if (line[0] == '#') { if (memcmp(line + 2, CONFIG_, strlen(CONFIG_))) continue; p = strchr(line + 2 + strlen(CONFIG_), ' '); if (!p) continue; *p++ = 0; if (strncmp(p, "is not set", 10)) continue; if (def == S_DEF_USER) { sym = sym_find(line + 2 + strlen(CONFIG_)); if (!sym) { if (warn_unknown) conf_warning("unknown symbol: %s", line + 2 + strlen(CONFIG_)); conf_set_changed(true); continue; } } else { sym = sym_lookup(line + 2 + strlen(CONFIG_), 0); if (sym->type == S_UNKNOWN) sym->type = S_BOOLEAN; } if (sym->flags & def_flags) { conf_notice("override: reassigning to symbol %s", sym->name); } switch (sym->type) { case S_BOOLEAN: case S_TRISTATE: sym->def[def].tri = no; sym->flags |= def_flags; break; default: ; } } else if (memcmp(line, CONFIG_, strlen(CONFIG_)) == 0) { p = strchr(line + strlen(CONFIG_), '='); if (!p) continue; *p++ = 0; p2 = strchr(p, '\n'); if (p2) { *p2-- = 0; if (*p2 == '\r') *p2 = 0; } sym = sym_find(line + strlen(CONFIG_)); if (!sym) { if (def == S_DEF_AUTO) { /* * Reading from include/config/auto.conf * If CONFIG_FOO previously existed in * auto.conf but it is missing now, * include/config/FOO must be touched. */ conf_touch_dep(line + strlen(CONFIG_)); } else { if (warn_unknown) conf_warning("unknown symbol: %s", line + strlen(CONFIG_)); conf_set_changed(true); } continue; } if (sym->flags & def_flags) { conf_notice("override: reassigning to symbol %s", sym->name); } if (conf_set_sym_val(sym, def, def_flags, p)) continue; } else { if (line[0] != '\r' && line[0] != '\n') conf_warning("unexpected data: %.*s", (int)strcspn(line, "\r\n"), line); continue; } if (sym && sym_is_choice_value(sym)) { struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym)); switch (sym->def[def].tri) { case no: break; case mod: if (cs->def[def].tri == yes) { conf_warning("%s creates inconsistent choice state", sym->name); cs->flags &= ~def_flags; } break; case yes: if (cs->def[def].tri != no) conf_notice("override: %s changes choice state", sym->name); cs->def[def].val = sym; break; } cs->def[def].tri = EXPR_OR(cs->def[def].tri, sym->def[def].tri); } } free(line); fclose(in); if (conf_warnings && werror) { fprintf(stderr, "\nERROR: %d warnings encountered, and warnings are errors.\n\n", conf_warnings); exit(1); } return 0; } int conf_read(const char *name) { struct symbol *sym; int conf_unsaved = 0; int i; conf_set_changed(false); if (conf_read_simple(name, S_DEF_USER)) { sym_calc_value(modules_sym); return 1; } sym_calc_value(modules_sym); for_all_symbols(i, sym) { sym_calc_value(sym); if (sym_is_choice(sym) || (sym->flags & SYMBOL_NO_WRITE)) continue; if (sym_has_value(sym) && (sym->flags & SYMBOL_WRITE)) { /* check that calculated value agrees with saved value */ switch (sym->type) { case S_BOOLEAN: case S_TRISTATE: if (sym->def[S_DEF_USER].tri == sym_get_tristate_value(sym)) continue; break; default: if (!strcmp(sym->curr.val, sym->def[S_DEF_USER].val)) continue; break; } } else if (!sym_has_value(sym) && !(sym->flags & SYMBOL_WRITE)) /* no previous value and not saved */ continue; conf_unsaved++; /* maybe print value in verbose mode... */ } for_all_symbols(i, sym) { if (sym_has_value(sym) && !sym_is_choice_value(sym)) { /* Reset values of generates values, so they'll appear * as new, if they should become visible, but that * doesn't quite work if the Kconfig and the saved * configuration disagree. */ if (sym->visible == no && !conf_unsaved) sym->flags &= ~SYMBOL_DEF_USER; switch (sym->type) { case S_STRING: case S_INT: case S_HEX: /* Reset a string value if it's out of range */ if (sym_string_within_range(sym, sym->def[S_DEF_USER].val)) break; sym->flags &= ~(SYMBOL_VALID|SYMBOL_DEF_USER); conf_unsaved++; break; default: break; } } } if (conf_warnings || conf_unsaved) conf_set_changed(true); return 0; } struct comment_style { const char *decoration; const char *prefix; const char *postfix; }; static const struct comment_style comment_style_pound = { .decoration = "#", .prefix = "#", .postfix = "#", }; static const struct comment_style comment_style_c = { .decoration = " *", .prefix = "/*", .postfix = " */", }; static void conf_write_heading(FILE *fp, const struct comment_style *cs) { if (!cs) return; fprintf(fp, "%s\n", cs->prefix); fprintf(fp, "%s Automatically generated file; DO NOT EDIT.\n", cs->decoration); fprintf(fp, "%s %s\n", cs->decoration, rootmenu.prompt->text); fprintf(fp, "%s\n", cs->postfix); } /* The returned pointer must be freed on the caller side */ static char *escape_string_value(const char *in) { const char *p; char *out; size_t len; len = strlen(in) + strlen("\"\"") + 1; p = in; while (1) { p += strcspn(p, "\"\\"); if (p[0] == '\0') break; len++; p++; } out = xmalloc(len); out[0] = '\0'; strcat(out, "\""); p = in; while (1) { len = strcspn(p, "\"\\"); strncat(out, p, len); p += len; if (p[0] == '\0') break; strcat(out, "\\"); strncat(out, p++, 1); } strcat(out, "\""); return out; } enum output_n { OUTPUT_N, OUTPUT_N_AS_UNSET, OUTPUT_N_NONE }; static void __print_symbol(FILE *fp, struct symbol *sym, enum output_n output_n, bool escape_string) { const char *val; char *escaped = NULL; if (sym->type == S_UNKNOWN) return; val = sym_get_string_value(sym); if ((sym->type == S_BOOLEAN || sym->type == S_TRISTATE) && output_n != OUTPUT_N && *val == 'n') { if (output_n == OUTPUT_N_AS_UNSET) fprintf(fp, "# %s%s is not set\n", CONFIG_, sym->name); return; } if (sym->type == S_STRING && escape_string) { escaped = escape_string_value(val); val = escaped; } fprintf(fp, "%s%s=%s\n", CONFIG_, sym->name, val); free(escaped); } static void print_symbol_for_dotconfig(FILE *fp, struct symbol *sym) { __print_symbol(fp, sym, OUTPUT_N_AS_UNSET, true); } static void print_symbol_for_autoconf(FILE *fp, struct symbol *sym) { int print_negatives = getenv("KCONFIG_NEGATIVES") != NULL; enum output_n out = OUTPUT_N_NONE; if (print_negatives) { out = OUTPUT_N; } __print_symbol(fp, sym, out, false); } void print_symbol_for_listconfig(struct symbol *sym) { __print_symbol(stdout, sym, OUTPUT_N, true); } static void print_symbol_for_c(FILE *fp, struct symbol *sym) { const char *val; const char *sym_suffix = ""; const char *val_prefix = ""; char *escaped = NULL; if (sym->type == S_UNKNOWN) return; val = sym_get_string_value(sym); switch (sym->type) { case S_BOOLEAN: case S_TRISTATE: switch (*val) { case 'n': if (getenv("KCONFIG_NEGATIVES") != NULL) { val = "0"; break; } return; case 'm': sym_suffix = "_MODULE"; /* fall through */ default: val = "1"; } break; case S_HEX: if (val[0] != '0' || (val[1] != 'x' && val[1] != 'X')) val_prefix = "0x"; /* fall through */ case S_INT: if (val[0] == '\0') { val = "0"; val_prefix = ""; } break; case S_STRING: escaped = escape_string_value(val); val = escaped; default: break; } fprintf(fp, "#define %s%s%s %s%s\n", CONFIG_, sym->name, sym_suffix, val_prefix, val); free(escaped); } static void print_symbol_for_rustccfg(FILE *fp, struct symbol *sym) { const char *val; const char *val_prefix = ""; char *val_prefixed = NULL; size_t val_prefixed_len; char *escaped = NULL; if (sym->type == S_UNKNOWN) return; val = sym_get_string_value(sym); switch (sym->type) { case S_BOOLEAN: case S_TRISTATE: /* * We do not care about disabled ones, i.e. no need for * what otherwise are "comments" in other printers. */ if (*val == 'n') return; /* * To have similar functionality to the C macro `IS_ENABLED()` * we provide an empty `--cfg CONFIG_X` here in both `y` * and `m` cases. * * Then, the common `fprintf()` below will also give us * a `--cfg CONFIG_X="y"` or `--cfg CONFIG_X="m"`, which can * be used as the equivalent of `IS_BUILTIN()`/`IS_MODULE()`. */ fprintf(fp, "--cfg=%s%s\n", CONFIG_, sym->name); break; case S_HEX: if (val[0] != '0' || (val[1] != 'x' && val[1] != 'X')) val_prefix = "0x"; break; default: break; } if (strlen(val_prefix) > 0) { val_prefixed_len = strlen(val) + strlen(val_prefix) + 1; val_prefixed = xmalloc(val_prefixed_len); snprintf(val_prefixed, val_prefixed_len, "%s%s", val_prefix, val); val = val_prefixed; } /* All values get escaped: the `--cfg` option only takes strings */ escaped = escape_string_value(val); val = escaped; fprintf(fp, "--cfg=%s%s=%s\n", CONFIG_, sym->name, val); free(escaped); free(val_prefixed); } /* * Write out a minimal config. * All values that has default values are skipped as this is redundant. */ int conf_write_defconfig(const char *filename) { struct symbol *sym; struct menu *menu; FILE *out; out = fopen(filename, "w"); if (!out) return 1; sym_clear_all_valid(); /* Traverse all menus to find all relevant symbols */ menu = rootmenu.list; while (menu != NULL) { sym = menu->sym; if (sym == NULL) { if (!menu_is_visible(menu)) goto next_menu; } else if (!sym_is_choice(sym)) { sym_calc_value(sym); if (!(sym->flags & SYMBOL_WRITE)) goto next_menu; sym->flags &= ~SYMBOL_WRITE; /* If we cannot change the symbol - skip */ if (!sym_is_changeable(sym)) goto next_menu; /* If symbol equals to default value - skip */ if (strcmp(sym_get_string_value(sym), sym_get_string_default(sym)) == 0) goto next_menu; /* * If symbol is a choice value and equals to the * default for a choice - skip. * But only if value is bool and equal to "y" and * choice is not "optional". * (If choice is "optional" then all values can be "n") */ if (sym_is_choice_value(sym)) { struct symbol *cs; struct symbol *ds; cs = prop_get_symbol(sym_get_choice_prop(sym)); ds = sym_choice_default(cs); if (!sym_is_optional(cs) && sym == ds) { if ((sym->type == S_BOOLEAN) && sym_get_tristate_value(sym) == yes) goto next_menu; } } print_symbol_for_dotconfig(out, sym); } next_menu: if (menu->list != NULL) { menu = menu->list; } else if (menu->next != NULL) { menu = menu->next; } else { while ((menu = menu->parent)) { if (menu->next != NULL) { menu = menu->next; break; } } } } fclose(out); return 0; } int conf_write(const char *name) { FILE *out; struct symbol *sym; struct menu *menu; const char *str; char tmpname[PATH_MAX + 1], oldname[PATH_MAX + 1]; char *env; int i; bool need_newline = false; if (!name) name = conf_get_configname(); if (!*name) { fprintf(stderr, "config name is empty\n"); return -1; } if (is_dir(name)) { fprintf(stderr, "%s: Is a directory\n", name); return -1; } if (make_parent_dir(name)) return -1; env = getenv("KCONFIG_OVERWRITECONFIG"); if (env && *env) { *tmpname = 0; out = fopen(name, "w"); } else { snprintf(tmpname, sizeof(tmpname), "%s.%d.tmp", name, (int)getpid()); out = fopen(tmpname, "w"); } if (!out) return 1; conf_write_heading(out, &comment_style_pound); if (!conf_get_changed()) sym_clear_all_valid(); menu = rootmenu.list; while (menu) { sym = menu->sym; if (!sym) { if (!menu_is_visible(menu)) goto next; str = menu_get_prompt(menu); fprintf(out, "\n" "#\n" "# %s\n" "#\n", str); need_newline = false; } else if (!(sym->flags & SYMBOL_CHOICE) && !(sym->flags & SYMBOL_WRITTEN)) { sym_calc_value(sym); if (!(sym->flags & SYMBOL_WRITE)) goto next; if (need_newline) { fprintf(out, "\n"); need_newline = false; } sym->flags |= SYMBOL_WRITTEN; print_symbol_for_dotconfig(out, sym); } next: if (menu->list) { menu = menu->list; continue; } end_check: if (!menu->sym && menu_is_visible(menu) && menu != &rootmenu && menu->prompt->type == P_MENU) { fprintf(out, "# end of %s\n", menu_get_prompt(menu)); need_newline = true; } if (menu->next) { menu = menu->next; } else { menu = menu->parent; if (menu) goto end_check; } } fclose(out); for_all_symbols(i, sym) sym->flags &= ~SYMBOL_WRITTEN; if (*tmpname) { if (is_same(name, tmpname)) { conf_message("No change to %s", name); unlink(tmpname); conf_set_changed(false); return 0; } snprintf(oldname, sizeof(oldname), "%s.old", name); rename(name, oldname); if (rename(tmpname, name)) return 1; } conf_message("configuration written to %s", name); conf_set_changed(false); return 0; } /* write a dependency file as used by kbuild to track dependencies */ static int conf_write_autoconf_cmd(const char *autoconf_name) { char name[PATH_MAX], tmp[PATH_MAX]; struct file *file; FILE *out; int ret; ret = snprintf(name, sizeof(name), "%s.cmd", autoconf_name); if (ret >= sizeof(name)) /* check truncation */ return -1; if (make_parent_dir(name)) return -1; ret = snprintf(tmp, sizeof(tmp), "%s.cmd.tmp", autoconf_name); if (ret >= sizeof(tmp)) /* check truncation */ return -1; out = fopen(tmp, "w"); if (!out) { perror("fopen"); return -1; } fprintf(out, "deps_config := \\\n"); for (file = file_list; file; file = file->next) fprintf(out, "\t%s \\\n", file->name); fprintf(out, "\n%s: $(deps_config)\n\n", autoconf_name); env_write_dep(out, autoconf_name); fprintf(out, "\n$(deps_config): ;\n"); fflush(out); ret = ferror(out); /* error check for all fprintf() calls */ fclose(out); if (ret) return -1; if (rename(tmp, name)) { perror("rename"); return -1; } return 0; } static int conf_touch_deps(void) { const char *name; struct symbol *sym; int res, i; /* * Upstream Kconfig sets depfile_path based on the directory * prefix of the autoconfig path, but coreboot overrides this * using the KCONFIG_SPLITCONFIG environment variable */ strcpy(depfile_path, conf_get_autobase_name()); depfile_prefix_len = strlen(depfile_path); name = conf_get_autoconfig_name(); conf_read_simple(name, S_DEF_AUTO); sym_calc_value(modules_sym); for_all_symbols(i, sym) { sym_calc_value(sym); if ((sym->flags & SYMBOL_NO_WRITE) || !sym->name) continue; if (sym->flags & SYMBOL_WRITE) { if (sym->flags & SYMBOL_DEF_AUTO) { /* * symbol has old and new value, * so compare them... */ switch (sym->type) { case S_BOOLEAN: case S_TRISTATE: if (sym_get_tristate_value(sym) == sym->def[S_DEF_AUTO].tri) continue; break; case S_STRING: case S_HEX: case S_INT: if (!strcmp(sym_get_string_value(sym), sym->def[S_DEF_AUTO].val)) continue; break; default: break; } } else { /* * If there is no old value, only 'no' (unset) * is allowed as new value. */ switch (sym->type) { case S_BOOLEAN: case S_TRISTATE: if (sym_get_tristate_value(sym) == no) continue; break; default: break; } } } else if (!(sym->flags & SYMBOL_DEF_AUTO)) /* There is neither an old nor a new value. */ continue; /* else * There is an old value, but no new value ('no' (unset) * isn't saved in auto.conf, so the old value is always * different from 'no'). */ res = conf_touch_dep(sym->name); if (res) return res; } return 0; } static int __conf_write_autoconf(const char *filename, void (*print_symbol)(FILE *, struct symbol *), const struct comment_style *comment_style) { char tmp[PATH_MAX]; FILE *file; struct symbol *sym; int ret, i; if (make_parent_dir(filename)) return -1; ret = snprintf(tmp, sizeof(tmp), "%s.tmp", filename); if (ret >= sizeof(tmp)) /* check truncation */ return -1; file = fopen(tmp, "w"); if (!file) { perror("fopen"); return -1; } conf_write_heading(file, comment_style); int print_negatives = getenv("KCONFIG_NEGATIVES") != NULL; for_all_symbols(i, sym) if (((sym->flags & SYMBOL_WRITE) || (print_negatives && sym->type != S_STRING)) && sym->name) print_symbol(file, sym); fflush(file); /* check possible errors in conf_write_heading() and print_symbol() */ ret = ferror(file); fclose(file); if (ret) return -1; if (rename(tmp, filename)) { perror("rename"); return -1; } return 0; } int conf_write_autoconf(int overwrite) { struct symbol *sym; const char *autoconf_name = conf_get_autoconfig_name(); int ret, i; if (!overwrite && is_present(autoconf_name)) return 0; ret = conf_write_autoconf_cmd(autoconf_name); if (ret) return -1; if (conf_touch_deps()) return 1; for_all_symbols(i, sym) sym_calc_value(sym); ret = __conf_write_autoconf(conf_get_autoheader_name(), print_symbol_for_c, &comment_style_c); if (ret) return ret; ret = __conf_write_autoconf(conf_get_rustccfg_name(), print_symbol_for_rustccfg, NULL); if (ret) return ret; /* * Create include/config/auto.conf. This must be the last step because * Kbuild has a dependency on auto.conf and this marks the successful * completion of the previous steps. */ ret = __conf_write_autoconf(conf_get_autoconfig_name(), print_symbol_for_autoconf, &comment_style_pound); if (ret) return ret; return 0; } static bool conf_changed; static void (*conf_changed_callback)(void); void conf_set_changed(bool val) { bool changed = conf_changed != val; conf_changed = val; if (conf_changed_callback && changed) conf_changed_callback(); } bool conf_get_changed(void) { return conf_changed; } void conf_set_changed_callback(void (*fn)(void)) { conf_changed_callback = fn; } void set_all_choice_values(struct symbol *csym) { struct property *prop; struct symbol *sym; struct expr *e; prop = sym_get_choice_prop(csym); /* * Set all non-assinged choice values to no */ expr_list_for_each_sym(prop->expr, e, sym) { if (!sym_has_value(sym)) sym->def[S_DEF_USER].tri = no; } csym->flags |= SYMBOL_DEF_USER; /* clear VALID to get value calculated */ csym->flags &= ~(SYMBOL_VALID | SYMBOL_NEED_SET_CHOICE_VALUES); }