diff options
Diffstat (limited to 'usr.bin/yacc/main.c')
| -rw-r--r-- | usr.bin/yacc/main.c | 438 |
1 files changed, 438 insertions, 0 deletions
diff --git a/usr.bin/yacc/main.c b/usr.bin/yacc/main.c new file mode 100644 index 0000000..a527032 --- /dev/null +++ b/usr.bin/yacc/main.c @@ -0,0 +1,438 @@ +/* + * Copyright (c) 1989 The Regents of the University of California. + * All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Robert Paul Corbett. + * + * 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. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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. + */ + +#if 0 +#ifndef lint +static char sccsid[] = "@(#)main.c 5.5 (Berkeley) 5/24/93"; +#endif +#endif + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <paths.h> +#include <signal.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> +#include "defs.h" + +char dflag; +char lflag; +char rflag; +char tflag; +char vflag; + +const char *symbol_prefix; +const char *file_prefix = "y"; +char temp_form[] = "yacc.XXXXXXXXXXX"; + +int lineno; +int outline; + +char *action_file_name; +char *code_file_name; +char *defines_file_name; +const char *input_file_name = ""; +char *output_file_name; +char *text_file_name; +char *union_file_name; +char *verbose_file_name; + +FILE *action_file; /* a temp file, used to save actions associated */ + /* with rules until the parser is written */ +FILE *code_file; /* y.code.c (used when the -r option is specified) */ +FILE *defines_file; /* y.tab.h */ +FILE *input_file; /* the input file */ +FILE *output_file; /* y.tab.c */ +FILE *text_file; /* a temp file, used to save text until all */ + /* symbols have been defined */ +FILE *union_file; /* a temp file, used to save the union */ + /* definition until all symbol have been */ + /* defined */ +FILE *verbose_file; /* y.output */ + +int nitems; +int nrules; +int nsyms; +int ntokens; +int nvars; + +int start_symbol; +char **symbol_name; +short *symbol_value; +short *symbol_prec; +char *symbol_assoc; + +short *ritem; +short *rlhs; +short *rrhs; +short *rprec; +char *rassoc; +short **derives; +char *nullable; + +static void create_file_names(void); +static void getargs(int, char **); +static void onintr(int); +static void open_files(void); +static void set_signals(void); +static void usage(void); + +volatile sig_atomic_t sigdie; + +__dead2 void +done(int k) +{ + if (action_file) { fclose(action_file); unlink(action_file_name); } + if (text_file) { fclose(text_file); unlink(text_file_name); } + if (union_file) { fclose(union_file); unlink(union_file_name); } + if (sigdie) { _exit(k); } + exit(k); +} + + +static void +onintr(int signo __unused) +{ + sigdie = 1; + done(1); +} + + +static void +set_signals(void) +{ +#ifdef SIGINT + if (signal(SIGINT, SIG_IGN) != SIG_IGN) + signal(SIGINT, onintr); +#endif +#ifdef SIGTERM + if (signal(SIGTERM, SIG_IGN) != SIG_IGN) + signal(SIGTERM, onintr); +#endif +#ifdef SIGHUP + if (signal(SIGHUP, SIG_IGN) != SIG_IGN) + signal(SIGHUP, onintr); +#endif +} + + +static void +usage(void) +{ + fprintf(stderr, "%s\n%s\n", + "usage: yacc [-dlrtv] [-b file_prefix] [-o output_filename]", + " [-p symbol_prefix] filename"); + exit(1); +} + + +static void +getargs(int argc, char *argv[]) +{ + int ch; + + while ((ch = getopt(argc, argv, "b:dlo:p:rtvy")) != -1) + { + switch (ch) + { + case 'b': + file_prefix = optarg; + break; + + case 'd': + dflag = 1; + break; + + case 'l': + lflag = 1; + break; + + case 'o': + output_file_name = optarg; + break; + + case 'p': + symbol_prefix = optarg; + break; + + case 'r': + rflag = 1; + break; + + case 't': + tflag = 1; + break; + + case 'v': + vflag = 1; + break; + + case 'y': + /* for bison compatibility -- byacc is already POSIX compatible */ + break; + + default: + usage(); + } + } + + if (optind + 1 != argc) + usage(); + if (strcmp(argv[optind], "-") == 0) + input_file = stdin; + else + input_file_name = argv[optind]; +} + + +void * +allocate(size_t n) +{ + void *p; + + p = NULL; + if (n) + { + p = calloc(1, n); + if (!p) no_space(); + } + return (p); +} + + +static void +create_file_names(void) +{ + int i, len; + const char *tmpdir; + + if (!(tmpdir = getenv("TMPDIR"))) + tmpdir = _PATH_TMP; + + len = strlen(tmpdir); + i = len + strlen(temp_form) + 1; + if (len && tmpdir[len-1] != '/') + ++i; + + action_file_name = malloc(i); + if (action_file_name == 0) no_space(); + text_file_name = malloc(i); + if (text_file_name == 0) no_space(); + union_file_name = malloc(i); + if (union_file_name == 0) no_space(); + + strcpy(action_file_name, tmpdir); + strcpy(text_file_name, tmpdir); + strcpy(union_file_name, tmpdir); + + if (len && tmpdir[len - 1] != '/') + { + action_file_name[len] = '/'; + text_file_name[len] = '/'; + union_file_name[len] = '/'; + ++len; + } + + strcpy(action_file_name + len, temp_form); + strcpy(text_file_name + len, temp_form); + strcpy(union_file_name + len, temp_form); + + action_file_name[len + 5] = 'a'; + text_file_name[len + 5] = 't'; + union_file_name[len + 5] = 'u'; + + if (output_file_name != 0) + { + file_prefix = output_file_name; + len = strlen(file_prefix); + } + else + { + len = strlen(file_prefix); + output_file_name = malloc(len + 7); + if (output_file_name == 0) + no_space(); + strcpy(output_file_name, file_prefix); + strcpy(output_file_name + len, OUTPUT_SUFFIX); + } + + if (rflag) + { + code_file_name = malloc(len + 8); + if (code_file_name == 0) + no_space(); + strcpy(code_file_name, file_prefix); + if (file_prefix == output_file_name) + { + /* + * XXX ".tab.c" here is OUTPUT_SUFFIX, but since its length is + * in various magic numbers, don't bother using the macro. + */ + if (len >= 6 && strcmp(code_file_name + len - 6, ".tab.c") == 0) + strcpy(code_file_name + len - 6, CODE_SUFFIX); + else if (len >= 2 && strcmp(code_file_name + len - 2, ".c") == 0) + strcpy(code_file_name + len - 2, CODE_SUFFIX); + else + strcpy(code_file_name + len, CODE_SUFFIX); + } + else + strcpy(code_file_name + len, CODE_SUFFIX); + } + else + code_file_name = output_file_name; + + if (dflag) + { + defines_file_name = malloc(len + 7); + if (defines_file_name == 0) + no_space(); + strcpy(defines_file_name, file_prefix); + if (file_prefix == output_file_name) + { +#define BISON_DEFINES_SUFFIX ".h" + if (len >= 2 && strcmp(defines_file_name + len - 2, ".c") == 0) + strcpy(defines_file_name + len - 2, BISON_DEFINES_SUFFIX); + else + strcpy(defines_file_name + len, BISON_DEFINES_SUFFIX); + } + else + strcpy(defines_file_name + len, DEFINES_SUFFIX); + } + + if (vflag) + { + verbose_file_name = malloc(len + 8); + if (verbose_file_name == 0) + no_space(); + strcpy(verbose_file_name, file_prefix); + if (file_prefix == output_file_name) + { + if (len >= 6 && strcmp(verbose_file_name + len - 6, ".tab.c") == 0) + strcpy(verbose_file_name + len - 6, VERBOSE_SUFFIX); + else if (len >= 2 && strcmp(verbose_file_name + len - 2, ".c") == 0) + strcpy(verbose_file_name + len - 2, VERBOSE_SUFFIX); + else + strcpy(verbose_file_name + len, VERBOSE_SUFFIX); + } + else + strcpy(verbose_file_name + len, VERBOSE_SUFFIX); + } +} + + +static void +open_files(void) +{ + int fd; + + create_file_names(); + + if (input_file == 0) + { + input_file = fopen(input_file_name, "r"); + if (input_file == 0) + open_error(input_file_name); + } + + fd = mkstemp(action_file_name); + if (fd < 0 || (action_file = fdopen(fd, "w")) == NULL) { + if (fd >= 0) + close(fd); + open_error(action_file_name); + } + fd = mkstemp(text_file_name); + if (fd < 0 || (text_file = fdopen(fd, "w")) == NULL) { + if (fd >= 0) + close(fd); + open_error(text_file_name); + } + fd = mkstemp(union_file_name); + if (fd < 0 || (union_file = fdopen(fd, "w")) == NULL) { + if (fd >= 0) + close(fd); + open_error(union_file_name); + } + + text_file = fopen(text_file_name, "w"); + if (text_file == 0) + open_error(text_file_name); + + if (vflag) + { + verbose_file = fopen(verbose_file_name, "w"); + if (verbose_file == 0) + open_error(verbose_file_name); + } + + if (dflag) + { + defines_file = fopen(defines_file_name, "w"); + if (defines_file == 0) + open_error(defines_file_name); + union_file = fopen(union_file_name, "w"); + if (union_file == 0) + open_error(union_file_name); + } + + output_file = fopen(output_file_name, "w"); + if (output_file == 0) + open_error(output_file_name); + + if (rflag) + { + code_file = fopen(code_file_name, "w"); + if (code_file == 0) + open_error(code_file_name); + } + else + code_file = output_file; +} + + +int +main(int argc, char *argv[]) +{ + set_signals(); + getargs(argc, argv); + open_files(); + reader(); + lr0(); + lalr(); + make_parser(); + verbose(); + output(); + done(0); + /*NOTREACHED*/ + return (0); +} |
