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- /*
- * Entry point, initialization, miscellaneous routines.
- */
-
- #include "less.h"
- #include "position.h"
- #include <setjmp.h>
-
- public int ispipe;
- public jmp_buf main_loop;
- public char * first_cmd;
- public char * every_first_cmd;
- public int new_file;
- public int is_tty;
- public char current_file[FILENAME];
- public char previous_file[FILENAME];
- public POSITION prev_pos;
- public int any_display;
- public int ac;
- public char ** av;
- public int curr_ac;
- #if LOGFILE
- public int logfile = -1;
- public int force_logfile = 0;
- public char * namelogfile = NULL;
- #endif
- #if EDITOR
- public char * editor;
- #endif
-
- extern int file;
- extern int nbufs;
- extern int sigs;
- extern int quit_at_eof;
- extern int p_nbufs, f_nbufs;
- extern int back_scroll;
- extern int top_scroll;
- extern int sc_height;
- extern int errmsgs;
-
- #ifdef AMIGA
- /********** amiga **************/
- #include <ctype.h>
- long CurrentDir();
- int called_from_WB = 0;
-
- char prog_name[32];
-
- /* max items and chars that *.c can expand to */
- #define MAXTEMPLATES 100
- #define MAXARGVCHARS 1000
- public char local_buffer[MAXARGVCHARS];
- public char *local_av[MAXTEMPLATES];
- #endif
-
- /*
- * Edit a new file.
- * Filename "-" means standard input.
- * No filename means the "current" file, from the command line.
- */
- public void
- edit(filename)
- register char *filename;
- {
- register int f;
- register char *m;
- POSITION initial_pos;
- char message[100];
- char tempfile[FILENAME];
- static int didpipe;
-
- initial_pos = NULL_POSITION;
- if (filename == NULL || *filename == '\0')
- {
- if (curr_ac >= ac)
- {
- error("No current file");
- return;
- }
- filename = av[curr_ac];
- }
- if (strcmp(filename, "#") == 0)
- {
- if (*previous_file == '\0')
- {
- error("no previous file");
- return;
- }
- strtcpy(tempfile, previous_file, sizeof(tempfile));
- filename = tempfile;
- initial_pos = prev_pos;
- }
- if (strcmp(filename, "-") == 0)
- {
- /*
- * Use standard input.
- */
- if (didpipe)
- {
- error("Can view standard input only once");
- return;
- }
- f = 0;
- } else if ((m = bad_file(filename, message, sizeof(message))) != NULL)
- {
- error(m);
- return;
- } else if ((f = open(filename, 0)) < 0)
- {
- error(errno_message(filename, message, sizeof(message)));
- return;
- }
-
- if (isatty(f))
- {
- /*
- * Not really necessary to call this an error,
- * but if the control terminal (for commands)
- * and the input file (for data) are the same,
- * we get weird results at best.
- */
- error("Can't take input from a terminal");
- if (f > 0)
- close(f);
- return;
- }
-
- #if LOGFILE
- /*
- * If he asked for a log file and we have opened standard input,
- * create the log file.
- * We take care not to blindly overwrite an existing file.
- */
- end_logfile();
- if (f == 0 && namelogfile != NULL && is_tty)
- {
- int exists;
- int answer;
-
- /*
- * {{ We could use access() here. }}
- */
- exists = open(namelogfile, 0);
- close(exists);
- exists = (exists >= 0);
-
- if (exists && !force_logfile)
- {
- static char w[] = "WARNING: log file exists: ";
- strcpy(message, w);
- strtcpy(message+sizeof(w)-1, namelogfile,
- sizeof(message)-sizeof(w));
- error(message);
- answer = 'X'; /* Ask the user what to do */
- } else
- answer = 'O'; /* Create the log file */
-
- loop:
- switch (answer)
- {
- case 'O': case 'o':
- logfile = creat(namelogfile, 0644);
- break;
- case 'A': case 'a':
- logfile = open(namelogfile, 1);
- if (lseek(logfile, (offset_t)0, 2) < 0)
- {
- close(logfile);
- logfile = -1;
- }
- break;
- case 'D': case 'd':
- answer = 0; /* Don't print an error message */
- break;
- case 'q':
- quit();
- default:
- putstr("\n Overwrite, Append, or Don't log? ");
- answer = getchr();
- putstr("\n");
- flush();
- goto loop;
- }
-
- if (logfile < 0 && answer != 0)
- {
- sprintf(message, "Cannot write to \"%s\"",
- namelogfile);
- error(message);
- }
- }
- #endif
-
- /*
- * We are now committed to using the new file.
- * Close the current input file and set up to use the new one.
- */
- if (file > 0)
- close(file);
- new_file = 1;
- strtcpy(previous_file, current_file, sizeof(previous_file));
- strtcpy(current_file, filename, sizeof(current_file));
- prev_pos = position(TOP);
- #ifdef AMIGA
- ispipe = ((f == 0) && !called_from_WB);
- #else
- ispipe = (f == 0);
- #endif
- if (ispipe)
- didpipe = 1;
- file = f;
- ch_init( (ispipe) ? p_nbufs : f_nbufs );
- init_mark();
-
- if (every_first_cmd != NULL)
- first_cmd = every_first_cmd;
-
- if (is_tty)
- {
- int no_display = !any_display;
- any_display = 1;
- if (no_display && errmsgs > 0)
- {
- /*
- * We displayed some messages on error output
- * (file descriptor 2; see error() function).
- * Before erasing the screen contents,
- * display the file name and wait for a keystroke.
- */
- error(filename);
- }
- /*
- * Indicate there is nothing displayed yet.
- */
- pos_clear();
- if (initial_pos != NULL_POSITION)
- jump_loc(initial_pos);
- }
- }
-
- /*
- * Edit the next file in the command line list.
- */
- public void
- next_file(n)
- int n;
- {
- if (curr_ac + n >= ac)
- {
- if (quit_at_eof)
- quit();
- error("No (N-th) next file");
- } else
- edit(av[curr_ac += n]);
- }
-
- /*
- * Edit the previous file in the command line list.
- */
- public void
- prev_file(n)
- int n;
- {
- if (curr_ac - n < 0)
- error("No (N-th) previous file");
- else
- edit(av[curr_ac -= n]);
- }
-
- /*
- * Copy a file directly to standard output.
- * Used if standard output is not a tty.
- */
- static void
- cat_file()
- {
- register int c;
-
- while ((c = ch_forw_get()) != EOF)
- putchr(c);
- flush();
- }
- #ifdef AMIGA
- /**************** amiga *****************************/
- /* Bob Leivian 4/28/87 fudge up things so it will work
- when called from Work Bench */
-
- char argvbuf[80];
- long old_dir;
- long current_dir;
-
- #include "workbench/startup.h"
-
- /* ignore AZTECs wb stuff */
- _wb_parse(ignore, ignore2)
- char *ignore;
- char *ignore2;
- {
- return;
- }
- #endif
-
-
- #ifdef NO_GETENV
- /* this requires the workbench disk --
- ignore all environment variables for now */
- char * getenv(ignore)
- {
- return NULL;
- }
- #endif
-
- /*
- * Entry point.
- */
- main(argc, argv)
- int argc;
- char *argv[];
- {
- char *getenv();
- int i,j;
-
- #ifdef AMIGA
- /***************** amiga ********************/
- /* if we were called from the workbench we will have no args
- but a pointer to WBstruct, get the filename from this structure */
- if(argc == 0) {
- struct WBStartup *WBmsg;
- struct WBArg *p;
-
- /* the argv is really the work bench structure */
- WBmsg = (struct WBStartup *) argv;
- p = WBmsg->sm_ArgList;
-
- /* fake up the args now */
- /* argv[0] = p->wa_Name; */
- argv[0] = "less";
- p++; /* ignore first parm (name) */
- strcpy(argvbuf, p->wa_Name);
- argc = 2;
- argv[1] = argvbuf;
- argv[2] = NULL;
-
- /* we have to setup this icons current dir (& release it later) */
- called_from_WB++;
- current_dir = p->wa_Lock;
- old_dir = CurrentDir(current_dir);
- }
-
- /* save my name, in case someone renamed less to something else */
- strcpy(prog_name, argv[0]);
-
- /* are we called to do a print function */
- if (argc > 1 && 0 == strcmp(argv[1], "-p")) {
-
- extern int Enable_Abort;
- long atol(), Output();
- long his_lock, DupLock();
-
- /* this was a print only request */
- argc--;
- argv++;
- Enable_Abort = 1;
-
- #ifdef NO
- /* if called from a workbench, he also passed the lock */
- if (isdigit(*argv[1])) {
-
- called_from_WB++;
- his_lock = atol(argv[1]);
- argc--;
- argv++;
-
- current_dir = DupLock(his_lock);
- old_dir = CurrentDir(current_dir);
- }
- #endif
- start_print(argc, argv);
-
- if (called_from_WB) {
- CurrentDir(old_dir);
-
- #ifdef NO
- /* close the stdout that my father opened */
- his_lock = Output();
- Close(his_lock);
- #endif
- }
- exit(0);
- }
- #endif
-
- /*
- * Process command line arguments and LESS environment arguments.
- * Command line arguments override environment arguments.
- */
- init_option();
- scan_option(getenv("LESS"));
- argv++;
- while ( (--argc > 0) &&
- (argv[0][0] == '-' || argv[0][0] == '+') &&
- argv[0][1] != '\0')
- scan_option(*argv++);
-
- #if EDITOR
- editor = getenv("EDITOR");
- if (editor == NULL || *editor == '\0')
- editor = "ed";
- #endif
-
- /*
- * Set up list of files to be examined.
- */
- ac = argc;
- av = argv;
-
- #ifdef AMIGA
- /* CLI doesn't expand templates link U*ix so we do it 'by hand' */
-
- for (i=0, j=0; i<ac; i++) {
- int temp = 0;
- char *p;
- char *scdir();
-
- if(index(av[i], '*') || index(av[i], '?')) {
-
- /* this is a template it needs to be expanded */
- while( (p = scdir(av[i])) && (j < MAXTEMPLATES)) {
- strcpy(&local_buffer[temp], p);
- local_av[j++] = &local_buffer[temp];
- temp += (strlen(&local_buffer[temp]) +1);
- if (temp > MAXARGVCHARS) break;
- }
- } else
- local_av[j++] = av[i];
- }
- av = local_av;
- local_av[j] = NULL;
- ac = j;
- #endif
-
- curr_ac = 0;
-
- /*
- * Set up terminal, etc.
- */
- #ifdef AMIGA
- is_tty = 1;
- ttopen();
- #else
- is_tty = isatty(1);
- if (!is_tty)
- {
- /*
- * Output is not a tty.
- * Just copy the input file(s) to output.
- */
- if (ac < 1)
- {
- edit("-");
- cat_file();
- } else
- {
- do
- {
- edit((char *)NULL);
- if (file >= 0)
- cat_file();
- } while (++curr_ac < ac);
- }
- exit(0);
- }
- #endif
-
- raw_mode(1);
- get_term();
- open_getchr();
- init();
-
- if (setjmp(main_loop))
- quit();
- init_signals();
-
- /*
- * Select the first file to examine.
- */
- if (ac < 1)
- edit("-"); /* Standard input */
- else
- {
- /*
- * Try all the files named as command arguments.
- * We are simply looking for one which can be
- * opened without error.
- */
- do
- {
- edit((char *)NULL);
- } while (file < 0 && ++curr_ac < ac);
- }
-
- if (file >= 0)
- commands();
- quit();
- /*NOTREACHED*/
- }
-
- /*
- * Copy a string, truncating to the specified length if necessary.
- * Unlike strncpy(), the resulting string is guaranteed to be null-terminated.
- */
- strtcpy(to, from, len)
- char *to;
- char *from;
- int len;
- {
- strncpy(to, from, len);
- to[len-1] = '\0';
- }
-
- /*
- * Exit the program.
- */
- public void
- quit()
- {
- /*
- * Put cursor at bottom left corner, clear the line,
- * reset the terminal modes, and exit.
- */
- #if LOGFILE
- end_logfile();
- #endif
- lower_left();
- clear_eol();
- deinit();
-
- flush();
- raw_mode(0);
-
- #ifdef AMIGA
- ttclose();
-
- if(called_from_WB)
- CurrentDir(old_dir);
- #endif
-
- exit(0);
- }
-