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Diffstat (limited to 'contrib/bc/dc/dc.c')
| -rw-r--r-- | contrib/bc/dc/dc.c | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/contrib/bc/dc/dc.c b/contrib/bc/dc/dc.c new file mode 100644 index 0000000..85da40f --- /dev/null +++ b/contrib/bc/dc/dc.c @@ -0,0 +1,173 @@ +/* + * implement the "dc" Desk Calculator language. + * + * Copyright (C) 1994, 1997 Free Software Foundation, Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2, or (at your option) + * any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, you can either send email to this + * program's author (see below) or write to: The Free Software Foundation, + * Inc.; 675 Mass Ave. Cambridge, MA 02139, USA. + */ + +/* Written with strong hiding of implementation details + * in their own specialized modules. + */ +/* This module contains the argument processing/main functions. + */ + +#include "config.h" + +#include <stdio.h> +#ifdef HAVE_STDLIB_H +# include <stdlib.h> +#endif +#ifdef HAVE_STRING_H +# include <string.h> +#else +# ifdef HAVE_STRINGS_H +# include <strings.h> +# endif +#endif +#include <getopt.h> +#include "dc.h" +#include "dc-proto.h" + +#include "version.h" + +#ifndef EXIT_SUCCESS /* C89 <stdlib.h> */ +# define EXIT_SUCCESS 0 +#endif +#ifndef EXIT_FAILURE /* C89 <stdlib.h> */ +# define EXIT_FAILURE 1 +#endif + +const char *progname; /* basename of program invocation */ + +/* your generic usage function */ +static void +usage DC_DECLARG((f)) + FILE *f DC_DECLEND +{ + fprintf(f, "\ +Usage: %s [OPTION] [file ...]\n\ + -e, --expression=EXPR evaluate expression\n\ + -f, --file=FILE evaluate contents of file\n\ + -h, --help display this help and exit\n\ + -V, --version output version information and exit\n\ +\n\ +Report bugs to @\n\ +", progname); +} + +static void +show_version DC_DECLVOID() +{ + printf("%s\n\n", DC_VERSION); + printf("Email bug reports to: bug-gnu-utils@prep.ai.mit.edu .\n"); + printf("Be sure to include the word ``dc'' \ +somewhere in the ``Subject:'' field.\n"); +} + +/* returns a pointer to one past the last occurance of c in s, + * or s if c does not occur in s. + */ +static char * +r1bindex DC_DECLARG((s, c)) + char *s DC_DECLSEP + int c DC_DECLEND +{ + char *p = strrchr(s, c); + + if (!p) + return s; + return p + 1; +} + +static void +try_file(const char *filename) { + FILE *input; + + if ( !(input=fopen(filename, "r")) ) { + fprintf(stderr, "Could not open file "); + perror(filename); + exit(EXIT_FAILURE); + } + if (dc_evalfile(input)) + exit(EXIT_FAILURE); + fclose(input); +} + + +int +main DC_DECLARG((argc, argv)) + int argc DC_DECLSEP + char **argv DC_DECLEND +{ + static struct option const long_opts[] = { + {"expression", required_argument, NULL, 'e'}, + {"file", required_argument, NULL, 'f'}, + {"help", no_argument, NULL, 'h'}, + {"version", no_argument, NULL, 'V'}, + {NULL, 0, NULL, 0} + }; + int did_eval = 0; + int c; + + progname = r1bindex(*argv, '/'); + dc_math_init(); + dc_string_init(); + dc_register_init(); + dc_array_init(); + + while ((c = getopt_long(argc, argv, "hVe:", long_opts, (int *)0)) != EOF) { + switch (c) { + case 'e': + { dc_data string = dc_makestring(optarg, strlen(optarg)); + if (dc_evalstr(string)) + return EXIT_SUCCESS; + dc_free_str(&string.v.string); + did_eval = 1; + } + break; + case 'f': + try_file(optarg); + did_eval = 1; + break; + case 'h': + usage(stdout); + return EXIT_SUCCESS; + case 'V': + show_version(); + return EXIT_SUCCESS; + default: + usage(stderr); + return EXIT_FAILURE; + } + } + + for (; optind < argc; ++optind) { + if (strcmp(argv[optind], "-") == 0) { + if (dc_evalfile(stdin)) + return EXIT_FAILURE; + } else { + try_file(argv[optind]); + } + did_eval = 1; + } + if (!did_eval) { + /* if no -e commands and no command files, then eval stdin */ + if (dc_evalfile(stdin)) + return EXIT_FAILURE; + } + return EXIT_SUCCESS; +} |
