/* $NetBSD: defined.c,v 1.1 2018/01/09 03:31:15 christos Exp $ */ /*- * Copyright (c) 2017 The NetBSD Foundation, Inc. * Copyright (c) 2016 The DragonFly Project * Copyright (c) 2014 The FreeBSD Foundation * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Tomohiro Kusumi <kusumi.tomohiro@gmail.com>. * * This software was developed by Edward Tomasz Napierala under sponsorship * from the FreeBSD Foundation. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * */ #include <sys/cdefs.h> __RCSID("$NetBSD: defined.c,v 1.1 2018/01/09 03:31:15 christos Exp $"); /* * All the "defined" stuff is for handling variables, * such as ${OSNAME}, in maps. */ #include <sys/types.h> #include <sys/utsname.h> #include <assert.h> #include <ctype.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include "common.h" static TAILQ_HEAD(, defined_value) defined_values; static const char * defined_find(const char *name) { struct defined_value *d; TAILQ_FOREACH(d, &defined_values, d_next) { if (strcmp(d->d_name, name) == 0) return d->d_value; } return NULL; } char * defined_expand(const char *string) { const char *value; char c, *expanded, *name; int ret; size_t i, before_len = 0, name_off = 0, name_len = 0, after_off = 0; bool backslashed = false, bracketed = false; expanded = checked_strdup(string); for (i = 0; string[i] != '\0'; i++) { c = string[i]; if (c == '\\' && backslashed == false) { backslashed = true; continue; } if (backslashed) { backslashed = false; continue; } backslashed = false; if (c != '$') continue; /* * The 'before_len' variable contains the number * of characters before the '$'. */ before_len = i; assert(i + 1 < strlen(string)); if (string[i + 1] == '{') bracketed = true; if (string[i + 1] == '\0') { log_warnx("truncated variable"); return NULL; } /* * Skip '$'. */ i++; if (bracketed) { if (string[i + 1] == '\0') { log_warnx("truncated variable"); return NULL; } /* * Skip '{'. */ i++; } /* * The 'name_off' variable contains the number * of characters before the variable name, * including the "$" or "${". */ name_off = i; for (; string[i] != '\0'; i++) { c = string[i]; /* * XXX: Decide on the set of characters that can be * used in a variable name. */ if (isalnum((unsigned char)c) || c == '_') continue; /* * End of variable name. */ if (bracketed) { if (c != '}') continue; /* * The 'after_off' variable contains the number * of characters before the rest of the string, * i.e. after the variable name. */ after_off = i + 1; assert(i > 1); assert(i - 1 > name_off); name_len = i - name_off; break; } after_off = i; assert(i > 1); assert(i > name_off); name_len = i - name_off; break; } name = strndup(string + name_off, name_len); if (name == NULL) log_err(1, "strndup"); value = defined_find(name); if (value == NULL) { log_warnx("undefined variable ${%s}", name); return NULL; } /* * Concatenate it back. */ ret = asprintf(&expanded, "%.*s%s%s", (int)before_len, string, value, string + after_off); if (ret < 0) log_err(1, "asprintf"); //log_debugx("\"%s\" expanded to \"%s\"", string, expanded); free(name); /* * Figure out where to start searching for next variable. */ string = expanded; i = before_len + strlen(value); backslashed = bracketed = false; before_len = name_off = name_len = after_off = 0; assert(i <= strlen(string)); } if (before_len != 0 || name_off != 0 || name_len != 0 || after_off != 0) { log_warnx("truncated variable"); return NULL; } return expanded; } static void defined_add(const char *name, const char *value) { struct defined_value *d; const char *found; found = defined_find(name); if (found != NULL) log_errx(1, "variable %s already defined", name); log_debugx("defining variable %s=%s", name, value); d = calloc(1, sizeof(*d)); if (d == NULL) log_err(1, "calloc"); d->d_name = checked_strdup(name); d->d_value = checked_strdup(value); TAILQ_INSERT_TAIL(&defined_values, d, d_next); } void defined_parse_and_add(char *def) { char *name, *value; value = def; name = strsep(&value, "="); if (value == NULL || value[0] == '\0') log_errx(1, "missing variable value"); if (name == NULL || name[0] == '\0') log_errx(1, "missing variable name"); defined_add(name, value); } void defined_init(void) { struct utsname name; int error; TAILQ_INIT(&defined_values); error = uname(&name); if (error != 0) log_err(1, "uname"); defined_add("ARCH", name.machine); defined_add("CPU", name.machine); defined_add("HOST", name.nodename); defined_add("OSNAME", name.sysname); defined_add("OSREL", name.release); defined_add("OSVERS", name.version); }