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Diffstat (limited to 'main.c')
| -rw-r--r-- | main.c | 205 |
1 files changed, 205 insertions, 0 deletions
@@ -0,0 +1,205 @@ +/* GNU ed - The GNU line editor. + Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012 + 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 3 of the License, 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, see <http://www.gnu.org/licenses/>. +*/ +/* + Return values: 0 for a normal exit, 1 for environmental problems + (file not found, invalid flags, I/O errors, etc), 2 to indicate a + corrupt or invalid input file, 3 for an internal consistency error + (eg, bug) which caused ed to panic. +*/ +/* + * CREDITS + * + * This program is based on the editor algorithm described in + * Brian W. Kernighan and P. J. Plauger's book "Software Tools + * in Pascal," Addison-Wesley, 1981. + * + * The buffering algorithm is attributed to Rodney Ruddock of + * the University of Guelph, Guelph, Ontario. + * + */ + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <sys/stat.h> +#include <locale.h> + +#include "carg_parser.h" +#include "ed.h" + + +static const char * const Program_name = "GNU Ed"; +static const char * const program_name = "ed"; +static const char * const program_year = "2012"; +static const char * invocation_name = 0; + +static bool restricted_ = false; /* if set, run in restricted mode */ +static bool scripted_ = false; /* if set, suppress diagnostics */ +static bool traditional_ = false; /* if set, be backwards compatible */ + + +bool restricted( void ) { return restricted_; } +bool scripted( void ) { return scripted_; } +bool traditional( void ) { return traditional_; } + + +static void show_help( void ) + { + printf( "%s - The GNU line editor.\n", Program_name ); + printf( "\nUsage: %s [options] [file]\n", invocation_name ); + printf( "\nOptions:\n" + " -h, --help display this help and exit\n" + " -V, --version output version information and exit\n" + " -G, --traditional run in compatibility mode\n" + " -l, --loose-exit-status exit with 0 status even if a command fails\n" + " -p, --prompt=STRING use STRING as an interactive prompt\n" + " -r, --restricted run in restricted mode\n" + " -s, --quiet, --silent suppress diagnostics\n" + " -v, --verbose be verbose\n" + "Start edit by reading in `file' if given.\n" + "If `file' begins with a `!', read output of shell command.\n" + "\nReport bugs to <bug-ed@gnu.org>.\n" + "Ed home page: http://www.gnu.org/software/ed/ed.html\n" + "General help using GNU software: http://www.gnu.org/gethelp\n" ); + } + + +static void show_version( void ) + { + printf( "%s %s\n", Program_name, PROGVERSION ); + printf( "Copyright (C) 1994 Andrew L. Moore.\n" + "Copyright (C) %s Free Software Foundation, Inc.\n", program_year ); + printf( "License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>\n" + "This is free software: you are free to change and redistribute it.\n" + "There is NO WARRANTY, to the extent permitted by law.\n" ); + } + + +void show_strerror( const char * const filename, const int errcode ) + { + if( !scripted_ ) + { + if( filename && filename[0] != 0 ) + fprintf( stderr, "%s: ", filename ); + fprintf( stderr, "%s\n", strerror( errcode ) ); + } + } + + +static void show_error( const char * const msg, const int errcode, const bool help ) + { + if( msg && msg[0] ) + { + fprintf( stderr, "%s: %s", program_name, msg ); + if( errcode > 0 ) fprintf( stderr, ": %s", strerror( errcode ) ); + fprintf( stderr, "\n" ); + } + if( help && invocation_name && invocation_name[0] ) + fprintf( stderr, "Try `%s --help' for more information.\n", invocation_name ); + } + + +/* return true if file descriptor is a regular file */ +bool is_regular_file( const int fd ) + { + struct stat st; + return ( fstat( fd, &st ) != 0 || S_ISREG( st.st_mode ) ); + } + + +bool may_access_filename( const char * const name ) + { + if( restricted_ && + ( *name == '!' || !strcmp( name, ".." ) || strchr( name, '/' ) ) ) + { + set_error_msg( "Shell access restricted" ); + return false; + } + return true; + } + + +int main( const int argc, const char * const argv[] ) + { + int argind; + bool loose = false; + const struct ap_Option options[] = + { + { 'G', "traditional", ap_no }, + { 'h', "help", ap_no }, + { 'l', "loose-exit-status", ap_no }, + { 'p', "prompt", ap_yes }, + { 'r', "restricted", ap_no }, + { 's', "quiet", ap_no }, + { 's', "silent", ap_no }, + { 'v', "verbose", ap_no }, + { 'V', "version", ap_no }, + { 0 , 0, ap_no } }; + + struct Arg_parser parser; + + if( !ap_init( &parser, argc, argv, options, 0 ) ) + { show_error( "Memory exhausted.", 0, false ); return 1; } + if( ap_error( &parser ) ) /* bad option */ + { show_error( ap_error( &parser ), 0, true ); return 1; } + invocation_name = argv[0]; + + for( argind = 0; argind < ap_arguments( &parser ); ++argind ) + { + const int code = ap_code( &parser, argind ); + const char * const arg = ap_argument( &parser, argind ); + if( !code ) break; /* no more options */ + switch( code ) + { + case 'G': traditional_ = true; break; /* backward compatibility */ + case 'h': show_help(); return 0; + case 'l': loose = true; break; + case 'p': set_prompt( arg ); break; + case 'r': restricted_ = true; break; + case 's': scripted_ = true; break; + case 'v': set_verbose(); break; + case 'V': show_version(); return 0; + default : show_error( "internal error: uncaught option.", 0, false ); + return 3; + } + } /* end process options */ + setlocale( LC_ALL, "" ); + if( !init_buffers() ) return 1; + + while( argind < ap_arguments( &parser ) ) + { + const char * const arg = ap_argument( &parser, argind ); + if( !strcmp( arg, "-" ) ) { scripted_ = true; ++argind; continue; } + if( may_access_filename( arg ) ) + { + if( read_file( arg, 0 ) < 0 && is_regular_file( 0 ) ) + return 2; + else if( arg[0] != '!' ) set_def_filename( arg ); + } + else + { + fputs( "?\n", stderr ); + if( arg[0] ) set_error_msg( "Invalid filename" ); + if( is_regular_file( 0 ) ) return 2; + } + break; + } + ap_free( &parser ); + + return main_loop( loose ); + } |