Annotation of src/usr.bin/less/prompt.c, Revision 1.1.1.2
1.1 etheisen 1: /*
1.1.1.2 ! millert 2: * Copyright (C) 1984-2002 Mark Nudelman
1.1 etheisen 3: *
1.1.1.2 ! millert 4: * You may distribute under the terms of either the GNU General Public
! 5: * License or the Less License, as specified in the README file.
1.1 etheisen 6: *
1.1.1.2 ! millert 7: * For more information about less, or for information on how to
! 8: * contact the author, see the README file.
1.1 etheisen 9: */
10:
11:
12: /*
13: * Prompting and other messages.
14: * There are three flavors of prompts, SHORT, MEDIUM and LONG,
15: * selected by the -m/-M options.
16: * There is also the "equals message", printed by the = command.
17: * A prompt is a message composed of various pieces, such as the
18: * name of the file being viewed, the percentage into the file, etc.
19: */
20:
21: #include "less.h"
22: #include "position.h"
23:
24: extern int pr_type;
25: extern int hit_eof;
26: extern int new_file;
27: extern int sc_width;
28: extern int so_s_width, so_e_width;
29: extern int linenums;
1.1.1.2 ! millert 30: extern int hshift;
1.1 etheisen 31: extern int sc_height;
32: extern int jump_sline;
33: extern IFILE curr_ifile;
34: #if EDITOR
35: extern char *editor;
1.1.1.2 ! millert 36: extern char *editproto;
1.1 etheisen 37: #endif
38:
39: /*
40: * Prototypes for the three flavors of prompts.
41: * These strings are expanded by pr_expand().
42: */
1.1.1.2 ! millert 43: static constant char s_proto[] =
! 44: "?n?f%f .?m(%T %i of %m) ..?e(END) ?x- Next\\: %x..%t";
! 45: static constant char m_proto[] =
! 46: "?n?f%f .?m(%T %i of %m) ..?e(END) ?x- Next\\: %x.:?pB%pB\\%:byte %bB?s/%s...%t";
! 47: static constant char M_proto[] =
! 48: "?f%f .?n?m(%T %i of %m) ..?ltlines %lt-%lb?L/%L. :byte %bB?s/%s. .?e(END) ?x- Next\\: %x.:?pB%pB\\%..%t";
! 49: static constant char e_proto[] =
! 50: "?f%f .?m(%T %i of %m) .?ltlines %lt-%lb?L/%L. .byte %bB?s/%s. ?e(END) :?pB%pB\\%..%t";
! 51: static constant char h_proto[] =
! 52: "HELP -- ?eEND -- Press g to see it again:Press RETURN for more., or q when done";
! 53: static constant char w_proto[] =
! 54: "Waiting for data";
1.1 etheisen 55:
56: public char *prproto[3];
1.1.1.2 ! millert 57: public char constant *eqproto = e_proto;
! 58: public char constant *hproto = h_proto;
! 59: public char constant *wproto = w_proto;
1.1 etheisen 60:
1.1.1.2 ! millert 61: static char message[PROMPT_SIZE];
1.1 etheisen 62: static char *mp;
63:
64: /*
65: * Initialize the prompt prototype strings.
66: */
67: public void
68: init_prompt()
69: {
70: prproto[0] = save(s_proto);
71: prproto[1] = save(m_proto);
72: prproto[2] = save(M_proto);
73: eqproto = save(e_proto);
1.1.1.2 ! millert 74: hproto = save(h_proto);
! 75: wproto = save(w_proto);
1.1 etheisen 76: }
77:
78: /*
1.1.1.2 ! millert 79: * Append a string to the end of the message.
! 80: */
! 81: static void
! 82: ap_str(s)
! 83: char *s;
! 84: {
! 85: int len;
! 86:
! 87: len = strlen(s);
! 88: if (mp + len >= message + PROMPT_SIZE)
! 89: len = message + PROMPT_SIZE - mp - 1;
! 90: strncpy(mp, s, len);
! 91: mp += len;
! 92: *mp = '\0';
! 93: }
! 94:
! 95: /*
! 96: * Append a character to the end of the message.
1.1 etheisen 97: */
98: static void
1.1.1.2 ! millert 99: ap_char(c)
! 100: char c;
1.1 etheisen 101: {
1.1.1.2 ! millert 102: char buf[2];
! 103:
! 104: buf[0] = c;
! 105: buf[1] = '\0';
! 106: ap_str(buf);
1.1 etheisen 107: }
108:
109: /*
110: * Append a POSITION (as a decimal integer) to the end of the message.
111: */
112: static void
113: ap_pos(pos)
114: POSITION pos;
115: {
1.1.1.2 ! millert 116: char buf[INT_STRLEN_BOUND(pos) + 2];
! 117:
! 118: postoa(pos, buf);
! 119: ap_str(buf);
1.1 etheisen 120: }
121:
122: /*
1.1.1.2 ! millert 123: * Append a line number to the end of the message.
1.1 etheisen 124: */
1.1.1.2 ! millert 125: static void
! 126: ap_linenum(linenum)
! 127: LINENUM linenum;
1.1 etheisen 128: {
1.1.1.2 ! millert 129: char buf[INT_STRLEN_BOUND(linenum) + 2];
! 130:
! 131: linenumtoa(linenum, buf);
! 132: ap_str(buf);
1.1 etheisen 133: }
134:
135: /*
1.1.1.2 ! millert 136: * Append an integer to the end of the message.
1.1 etheisen 137: */
138: static void
1.1.1.2 ! millert 139: ap_int(num)
! 140: int num;
1.1 etheisen 141: {
1.1.1.2 ! millert 142: char buf[INT_STRLEN_BOUND(num) + 2];
! 143:
! 144: inttoa(num, buf);
! 145: ap_str(buf);
1.1 etheisen 146: }
147:
148: /*
149: * Append a question mark to the end of the message.
150: */
151: static void
152: ap_quest()
153: {
1.1.1.2 ! millert 154: ap_str("?");
1.1 etheisen 155: }
156:
157: /*
158: * Return the "current" byte offset in the file.
159: */
160: static POSITION
161: curr_byte(where)
162: int where;
163: {
164: POSITION pos;
165:
166: pos = position(where);
167: while (pos == NULL_POSITION && where >= 0 && where < sc_height)
168: pos = position(++where);
169: if (pos == NULL_POSITION)
170: pos = ch_length();
171: return (pos);
172: }
173:
174: /*
175: * Return the value of a prototype conditional.
176: * A prototype string may include conditionals which consist of a
177: * question mark followed by a single letter.
178: * Here we decode that letter and return the appropriate boolean value.
179: */
180: static int
181: cond(c, where)
182: char c;
183: int where;
184: {
1.1.1.2 ! millert 185: POSITION len;
! 186:
1.1 etheisen 187: switch (c)
188: {
189: case 'a': /* Anything in the message yet? */
190: return (mp > message);
191: case 'b': /* Current byte offset known? */
192: return (curr_byte(where) != NULL_POSITION);
1.1.1.2 ! millert 193: case 'c':
! 194: return (hshift != 0);
1.1 etheisen 195: case 'e': /* At end of file? */
196: return (hit_eof);
197: case 'f': /* Filename known? */
198: return (strcmp(get_filename(curr_ifile), "-") != 0);
199: case 'l': /* Line number known? */
1.1.1.2 ! millert 200: case 'd': /* Same as l */
1.1 etheisen 201: return (linenums);
202: case 'L': /* Final line number known? */
1.1.1.2 ! millert 203: case 'D': /* Same as L */
1.1 etheisen 204: return (linenums && ch_length() != NULL_POSITION);
205: case 'm': /* More than one file? */
1.1.1.2 ! millert 206: #if TAGS
! 207: return (ntags() ? (ntags() > 1) : (nifile() > 1));
! 208: #else
1.1 etheisen 209: return (nifile() > 1);
1.1.1.2 ! millert 210: #endif
1.1 etheisen 211: case 'n': /* First prompt in a new file? */
1.1.1.2 ! millert 212: #if TAGS
! 213: return (ntags() ? 1 : new_file);
! 214: #else
1.1 etheisen 215: return (new_file);
1.1.1.2 ! millert 216: #endif
! 217: case 'p': /* Percent into file (bytes) known? */
1.1 etheisen 218: return (curr_byte(where) != NULL_POSITION &&
219: ch_length() > 0);
1.1.1.2 ! millert 220: case 'P': /* Percent into file (lines) known? */
! 221: return (currline(where) != 0 &&
! 222: (len = ch_length()) > 0 &&
! 223: find_linenum(len) != 0);
1.1 etheisen 224: case 's': /* Size of file known? */
225: case 'B':
226: return (ch_length() != NULL_POSITION);
227: case 'x': /* Is there a "next" file? */
1.1.1.2 ! millert 228: #if TAGS
! 229: if (ntags())
! 230: return (0);
! 231: #endif
1.1 etheisen 232: return (next_ifile(curr_ifile) != NULL_IFILE);
233: }
234: return (0);
235: }
236:
237: /*
238: * Decode a "percent" prototype character.
239: * A prototype string may include various "percent" escapes;
240: * that is, a percent sign followed by a single letter.
241: * Here we decode that letter and take the appropriate action,
242: * usually by appending something to the message being built.
243: */
244: static void
1.1.1.2 ! millert 245: protochar(c, where, iseditproto)
1.1 etheisen 246: int c;
247: int where;
1.1.1.2 ! millert 248: int iseditproto;
1.1 etheisen 249: {
250: POSITION pos;
251: POSITION len;
252: int n;
1.1.1.2 ! millert 253: LINENUM linenum;
! 254: LINENUM last_linenum;
1.1 etheisen 255: IFILE h;
256:
257: switch (c)
258: {
259: case 'b': /* Current byte offset */
260: pos = curr_byte(where);
261: if (pos != NULL_POSITION)
262: ap_pos(pos);
263: else
264: ap_quest();
265: break;
1.1.1.2 ! millert 266: case 'c':
! 267: ap_int(hshift);
! 268: break;
! 269: case 'd': /* Current page number */
! 270: linenum = currline(where);
! 271: if (linenum > 0 && sc_height > 1)
! 272: ap_linenum(((linenum - 1) / (sc_height - 1)) + 1);
! 273: else
! 274: ap_quest();
! 275: break;
! 276: case 'D': /* Last page number */
! 277: len = ch_length();
! 278: if (len == NULL_POSITION || len == ch_zero() ||
! 279: (linenum = find_linenum(len)) <= 0)
! 280: ap_quest();
! 281: else
! 282: ap_linenum(((linenum - 1) / (sc_height - 1)) + 1);
! 283: break;
1.1 etheisen 284: #if EDITOR
285: case 'E': /* Editor name */
286: ap_str(editor);
287: break;
288: #endif
289: case 'f': /* File name */
290: ap_str(get_filename(curr_ifile));
291: break;
292: case 'i': /* Index into list of files */
1.1.1.2 ! millert 293: #if TAGS
! 294: if (ntags())
! 295: ap_int(curr_tag());
! 296: else
! 297: #endif
! 298: ap_int(get_index(curr_ifile));
1.1 etheisen 299: break;
300: case 'l': /* Current line number */
1.1.1.2 ! millert 301: linenum = currline(where);
! 302: if (linenum != 0)
! 303: ap_linenum(linenum);
1.1 etheisen 304: else
305: ap_quest();
306: break;
307: case 'L': /* Final line number */
308: len = ch_length();
309: if (len == NULL_POSITION || len == ch_zero() ||
1.1.1.2 ! millert 310: (linenum = find_linenum(len)) <= 0)
1.1 etheisen 311: ap_quest();
312: else
1.1.1.2 ! millert 313: ap_linenum(linenum-1);
1.1 etheisen 314: break;
315: case 'm': /* Number of files */
1.1.1.2 ! millert 316: #if TAGS
! 317: n = ntags();
! 318: if (n)
! 319: ap_int(n);
! 320: else
! 321: #endif
! 322: ap_int(nifile());
1.1 etheisen 323: break;
1.1.1.2 ! millert 324: case 'p': /* Percent into file (bytes) */
1.1 etheisen 325: pos = curr_byte(where);
326: len = ch_length();
327: if (pos != NULL_POSITION && len > 0)
328: ap_int(percentage(pos,len));
329: else
330: ap_quest();
331: break;
1.1.1.2 ! millert 332: case 'P': /* Percent into file (lines) */
! 333: linenum = currline(where);
! 334: if (linenum == 0 ||
! 335: (len = ch_length()) == NULL_POSITION || len == ch_zero() ||
! 336: (last_linenum = find_linenum(len)) <= 0)
! 337: ap_quest();
! 338: else
! 339: ap_int(percentage(linenum, last_linenum));
! 340: break;
1.1 etheisen 341: case 's': /* Size of file */
342: case 'B':
343: len = ch_length();
344: if (len != NULL_POSITION)
345: ap_pos(len);
346: else
347: ap_quest();
348: break;
349: case 't': /* Truncate trailing spaces in the message */
350: while (mp > message && mp[-1] == ' ')
351: mp--;
352: break;
1.1.1.2 ! millert 353: case 'T': /* Type of list */
! 354: #if TAGS
! 355: if (ntags())
! 356: ap_str("tag");
! 357: else
! 358: #endif
! 359: ap_str("file");
! 360: break;
1.1 etheisen 361: case 'x': /* Name of next file */
362: h = next_ifile(curr_ifile);
363: if (h != NULL_IFILE)
364: ap_str(get_filename(h));
365: else
366: ap_quest();
367: break;
368: }
369: }
370:
371: /*
372: * Skip a false conditional.
373: * When a false condition is found (either a false IF or the ELSE part
374: * of a true IF), this routine scans the prototype string to decide
375: * where to resume parsing the string.
376: * We must keep track of nested IFs and skip them properly.
377: */
378: static char *
379: skipcond(p)
380: register char *p;
381: {
382: register int iflevel;
383:
384: /*
385: * We came in here after processing a ? or :,
386: * so we start nested one level deep.
387: */
388: iflevel = 1;
389:
390: for (;;) switch (*++p)
391: {
392: case '?':
393: /*
394: * Start of a nested IF.
395: */
396: iflevel++;
397: break;
398: case ':':
399: /*
400: * Else.
401: * If this matches the IF we came in here with,
402: * then we're done.
403: */
404: if (iflevel == 1)
405: return (p);
406: break;
407: case '.':
408: /*
409: * Endif.
410: * If this matches the IF we came in here with,
411: * then we're done.
412: */
413: if (--iflevel == 0)
414: return (p);
415: break;
416: case '\\':
417: /*
418: * Backslash escapes the next character.
419: */
420: ++p;
421: break;
422: case '\0':
423: /*
424: * Whoops. Hit end of string.
425: * This is a malformed conditional, but just treat it
426: * as if all active conditionals ends here.
427: */
428: return (p-1);
429: }
430: /*NOTREACHED*/
431: }
432:
1.1.1.2 ! millert 433: /*
! 434: * Decode a char that represents a position on the screen.
! 435: */
1.1 etheisen 436: static char *
437: wherechar(p, wp)
438: char *p;
439: int *wp;
440: {
441: switch (*p)
442: {
1.1.1.2 ! millert 443: case 'b': case 'd': case 'l': case 'p': case 'P':
1.1 etheisen 444: switch (*++p)
445: {
446: case 't': *wp = TOP; break;
447: case 'm': *wp = MIDDLE; break;
448: case 'b': *wp = BOTTOM; break;
449: case 'B': *wp = BOTTOM_PLUS_ONE; break;
450: case 'j': *wp = adjsline(jump_sline); break;
451: default: *wp = TOP; p--; break;
452: }
453: }
454: return (p);
455: }
456:
457: /*
458: * Construct a message based on a prototype string.
459: */
460: public char *
461: pr_expand(proto, maxwidth)
462: char *proto;
463: int maxwidth;
464: {
465: register char *p;
466: register int c;
467: int where;
468:
469: mp = message;
470:
471: if (*proto == '\0')
472: return ("");
473:
474: for (p = proto; *p != '\0'; p++)
475: {
476: switch (*p)
477: {
478: default: /* Just put the character in the message */
1.1.1.2 ! millert 479: ap_char(*p);
1.1 etheisen 480: break;
481: case '\\': /* Backslash escapes the next character */
482: p++;
1.1.1.2 ! millert 483: ap_char(*p);
1.1 etheisen 484: break;
485: case '?': /* Conditional (IF) */
486: if ((c = *++p) == '\0')
487: --p;
488: else
489: {
1.1.1.2 ! millert 490: where = 0;
1.1 etheisen 491: p = wherechar(p, &where);
492: if (!cond(c, where))
493: p = skipcond(p);
494: }
495: break;
496: case ':': /* ELSE */
497: p = skipcond(p);
498: break;
499: case '.': /* ENDIF */
500: break;
501: case '%': /* Percent escape */
502: if ((c = *++p) == '\0')
503: --p;
504: else
505: {
1.1.1.2 ! millert 506: where = 0;
1.1 etheisen 507: p = wherechar(p, &where);
1.1.1.2 ! millert 508: protochar(c, where,
! 509: #if EDITOR
! 510: (proto == editproto));
! 511: #else
! 512: 0);
! 513: #endif
! 514:
1.1 etheisen 515: }
516: break;
517: }
518: }
519:
520: if (mp == message)
521: return (NULL);
522: if (maxwidth > 0 && mp >= message + maxwidth)
523: {
524: /*
525: * Message is too long.
526: * Return just the final portion of it.
527: */
528: return (mp - maxwidth);
529: }
530: return (message);
531: }
532:
533: /*
534: * Return a message suitable for printing by the "=" command.
535: */
536: public char *
537: eq_message()
538: {
539: return (pr_expand(eqproto, 0));
540: }
541:
542: /*
543: * Return a prompt.
544: * This depends on the prompt type (SHORT, MEDIUM, LONG), etc.
545: * If we can't come up with an appropriate prompt, return NULL
546: * and the caller will prompt with a colon.
547: */
548: public char *
549: pr_string()
550: {
1.1.1.2 ! millert 551: char *prompt;
! 552:
! 553: prompt = pr_expand((ch_getflags() & CH_HELPFILE) ?
! 554: hproto : prproto[pr_type],
! 555: sc_width-so_s_width-so_e_width-2);
! 556: new_file = 0;
! 557: return (prompt);
! 558: }
! 559:
! 560: /*
! 561: * Return a message suitable for printing while waiting in the F command.
! 562: */
! 563: public char *
! 564: wait_message()
! 565: {
! 566: return (pr_expand(wproto, sc_width-so_s_width-so_e_width-2));
1.1 etheisen 567: }
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