mirror of
https://github.com/GnoConsortium/gno.git
synced 2024-10-31 11:07:44 +00:00
294 lines
4.9 KiB
C
294 lines
4.9 KiB
C
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/*
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* Entry point, initialization, miscellaneous routines.
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*/
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#pragma stacksize 1280
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include "less.h"
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#include "position.h"
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#ifdef _ORCAC_
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segment "LoadSegONE";
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#endif
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public int ispipe;
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public char * every_first_cmd = NULL;
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public int new_file;
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public int is_tty;
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public IFILE curr_ifile = NULL_IFILE;
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public IFILE old_ifile = NULL_IFILE;
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public struct scrpos initial_scrpos;
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public int any_display = 0;
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public int scroll;
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public char * progname;
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public int quitting;
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extern int file;
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extern int quit_at_eof;
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extern int cbufs;
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extern int errmsgs;
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extern int screen_trashed;
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extern int force_open;
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#if LOGFILE
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public int logfile = -1;
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public int force_logfile = 0;
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public char * namelogfile = NULL;
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#endif
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#if EDITOR
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public char * editor;
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public char * editproto;
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#endif
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#if TAGS
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extern char * tagfile;
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extern char * tagpattern;
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extern int tagoption;
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#endif
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/*
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* Entry point.
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*/
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int main(argc, argv)
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int argc;
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char *argv[];
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{
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IFILE h;
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int nofiles;
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extern char *getenv();
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extern int _INITGNOSTDIO(void);
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/*if(!_INITGNOSTDIO())
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{
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fprintf(stderr, "\n%s: requires GNO/ME to operate\n\n");
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exit(1);
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} */
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progname = *argv++;
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/*
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* Process command line arguments and LESS environment arguments.
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* Command line arguments override environment arguments.
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*/
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init_prompt();
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init_charset();
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init_option();
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scan_option(getenv("LESS"));
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#define isoptstring(s) (((s)[0] == '-' || (s)[0] == '+') && (s)[1] != '\0')
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while (--argc > 0 && (isoptstring(argv[0]) || isoptpending()))
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scan_option(*argv++);
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#undef isoptstring
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if (isoptpending())
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{
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/*
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* Last command line option was a flag requiring a
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* following string, but there was no following string.
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*/
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nopendopt();
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quit(0);
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}
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#if USERFILE
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/*
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* Try to use the lesskey file "$HOME/.less".
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*/
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add_hometable();
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#endif
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#if EDITOR
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editor = getenv("EDITOR");
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if (editor == NULL || *editor == '\0')
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editor = EDIT_PGM;
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editproto = getenv("LESSEDIT");
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if (editproto == NULL || *editproto == '\0')
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editproto = "%E ?lm+%lm. %f";
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#endif
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/*
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* Set up terminal, etc.
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*/
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/* is_tty = isatty(1);*/
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is_tty = isatty(STDOUT_FILENO);
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if (!is_tty)
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{
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/*
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* Output is not a tty.
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* Just copy the input file(s) to output.
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*/
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if (argc <= 0)
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{
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if (edit("-", 0) == 0)
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cat_file();
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} else
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{
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while (--argc >= 0)
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{
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if (edit(*argv++, 0) == 0)
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cat_file();
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}
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}
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quit(0);
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}
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/*
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* Call get_ifile with all the command line filenames
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* to "register" them with the ifile system.
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*/
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h = NULL_IFILE;
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while (--argc >= 0)
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h = get_ifile(*argv++, h);
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init_mark();
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raw_mode(1);
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get_term();
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open_getchr();
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init_signals(1);
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/*
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* Select the first file to examine.
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*/
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#if TAGS
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if (tagoption)
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{
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/*
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* A -t option was given.
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* Verify that no filenames were also given.
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* Edit the file selected by the "tags" search,
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* and search for the proper line in the file.
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*/
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if (nifile() > 0)
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{
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error("No filenames allowed with -t option", NULL_PARG);
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quit(1);
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}
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if (tagfile == NULL)
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quit(1);
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if (edit(tagfile, 0) || tagsearch())
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quit(1);
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nofiles = 0;
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} else
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#endif
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if (nifile() == 0)
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nofiles = edit("-", 0); /* Standard input */
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else
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nofiles = edit_first();
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if (nofiles)
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{
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quit(1);
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/*NOTREACHED*/
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}
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init();
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commands();
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quit(0);
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/*NOTREACHED*/
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}
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/*
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* Copy a string, truncating to the specified length if necessary.
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* Unlike strncpy(), the resulting string is guaranteed to be null-terminated.
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*/
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public void
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strtcpy(to, from, len)
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char *to;
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char *from;
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unsigned int len;
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{
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strncpy(to, from, len);
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to[len-1] = '\0';
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}
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/*
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* Copy a string to a "safe" place
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* (that is, to a buffer allocated by calloc).
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*/
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public char *
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save(s)
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char *s;
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{
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register char *p;
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p = (char *) ecalloc(strlen(s)+1, sizeof(char));
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strcpy(p, s);
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return (p);
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}
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public VOID_POINTER
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ecalloc(count, size)
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int count;
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unsigned int size;
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{
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register VOID_POINTER p;
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p = calloc(count, size);
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if (p != NULL)
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return (p);
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error("Cannot allocate memory", NULL_PARG);
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quit(1);
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/*NOTREACHED*/
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}
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/*
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* Skip leading spaces in a string.
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*/
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public char *
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skipsp(s)
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register char *s;
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{
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while (*s == ' ' || *s == '\t')
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s++;
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return (s);
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}
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/*
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* Exit the program.
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*/
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public void
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quit(status)
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int status;
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{
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static int save_status;
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/*
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* Put cursor at bottom left corner, clear the line,
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* reset the terminal modes, and exit.
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*/
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if (status < 0)
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status = save_status;
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else
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save_status = status;
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quitting = 1;
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#if LOGFILE
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end_logfile();
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#endif
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if (any_display)
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{
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lower_left();
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clear_eol();
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}
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deinit();
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flush();
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raw_mode(0);
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#if __MSDOS__
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restore_screen();
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/*
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* If we don't close 2, we get some garbage from
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* 2's buffer when it flushes automatically.
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* I cannot track this one down RB
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* The same bug shows up if we use ^C^C to abort.
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*/
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close(2);
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#endif
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exit(status);
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}
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