--- /dev/null
+/*
+ * Copyright (C) 1984-2011 Mark Nudelman
+ *
+ * You may distribute under the terms of either the GNU General Public
+ * License or the Less License, as specified in the README file.
+ *
+ * For more information about less, or for information on how to
+ * contact the author, see the README file.
+ */
+
+
+/*
+ * Prompting and other messages.
+ * There are three flavors of prompts, SHORT, MEDIUM and LONG,
+ * selected by the -m/-M options.
+ * There is also the "equals message", printed by the = command.
+ * A prompt is a message composed of various pieces, such as the
+ * name of the file being viewed, the percentage into the file, etc.
+ */
+
+#include "less.h"
+#include "position.h"
+
+extern int pr_type;
+extern int new_file;
+extern int sc_width;
+extern int so_s_width, so_e_width;
+extern int linenums;
+extern int hshift;
+extern int sc_height;
+extern int jump_sline;
+extern int less_is_more;
+extern IFILE curr_ifile;
+#if EDITOR
+extern char *editor;
+extern char *editproto;
+#endif
+
+/*
+ * Prototypes for the three flavors of prompts.
+ * These strings are expanded by pr_expand().
+ */
+static constant char s_proto[] =
+ "?n?f%f .?m(%T %i of %m) ..?e(END) ?x- Next\\: %x..%t";
+static constant char m_proto[] =
+ "?n?f%f .?m(%T %i of %m) ..?e(END) ?x- Next\\: %x.:?pB%pB\\%:byte %bB?s/%s...%t";
+static constant char M_proto[] =
+ "?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";
+static constant char e_proto[] =
+ "?f%f .?m(%T %i of %m) .?ltlines %lt-%lb?L/%L. .byte %bB?s/%s. ?e(END) :?pB%pB\\%..%t";
+static constant char h_proto[] =
+ "HELP -- ?eEND -- Press g to see it again:Press RETURN for more., or q when done";
+static constant char w_proto[] =
+ "Waiting for data";
+static constant char more_proto[] =
+ "--More--(?eEND ?x- Next\\: %x.:?pB%pB\\%:byte %bB?s/%s...%t)";
+
+public char *prproto[3];
+public char constant *eqproto = e_proto;
+public char constant *hproto = h_proto;
+public char constant *wproto = w_proto;
+
+static char message[PROMPT_SIZE];
+static char *mp;
+
+/*
+ * Initialize the prompt prototype strings.
+ */
+ public void
+init_prompt()
+{
+ prproto[0] = save(s_proto);
+ prproto[1] = save(less_is_more ? more_proto : m_proto);
+ prproto[2] = save(M_proto);
+ eqproto = save(e_proto);
+ hproto = save(h_proto);
+ wproto = save(w_proto);
+}
+
+/*
+ * Append a string to the end of the message.
+ */
+ static void
+ap_str(s)
+ char *s;
+{
+ int len;
+
+ len = strlen(s);
+ if (mp + len >= message + PROMPT_SIZE)
+ len = message + PROMPT_SIZE - mp - 1;
+ strncpy(mp, s, len);
+ mp += len;
+ *mp = '\0';
+}
+
+/*
+ * Append a character to the end of the message.
+ */
+ static void
+ap_char(c)
+ char c;
+{
+ char buf[2];
+
+ buf[0] = c;
+ buf[1] = '\0';
+ ap_str(buf);
+}
+
+/*
+ * Append a POSITION (as a decimal integer) to the end of the message.
+ */
+ static void
+ap_pos(pos)
+ POSITION pos;
+{
+ char buf[INT_STRLEN_BOUND(pos) + 2];
+
+ postoa(pos, buf);
+ ap_str(buf);
+}
+
+/*
+ * Append a line number to the end of the message.
+ */
+ static void
+ap_linenum(linenum)
+ LINENUM linenum;
+{
+ char buf[INT_STRLEN_BOUND(linenum) + 2];
+
+ linenumtoa(linenum, buf);
+ ap_str(buf);
+}
+
+/*
+ * Append an integer to the end of the message.
+ */
+ static void
+ap_int(num)
+ int num;
+{
+ char buf[INT_STRLEN_BOUND(num) + 2];
+
+ inttoa(num, buf);
+ ap_str(buf);
+}
+
+/*
+ * Append a question mark to the end of the message.
+ */
+ static void
+ap_quest()
+{
+ ap_str("?");
+}
+
+/*
+ * Return the "current" byte offset in the file.
+ */
+ static POSITION
+curr_byte(where)
+ int where;
+{
+ POSITION pos;
+
+ pos = position(where);
+ while (pos == NULL_POSITION && where >= 0 && where < sc_height-1)
+ pos = position(++where);
+ if (pos == NULL_POSITION)
+ pos = ch_length();
+ return (pos);
+}
+
+/*
+ * Return the value of a prototype conditional.
+ * A prototype string may include conditionals which consist of a
+ * question mark followed by a single letter.
+ * Here we decode that letter and return the appropriate boolean value.
+ */
+ static int
+cond(c, where)
+ char c;
+ int where;
+{
+ POSITION len;
+
+ switch (c)
+ {
+ case 'a': /* Anything in the message yet? */
+ return (mp > message);
+ case 'b': /* Current byte offset known? */
+ return (curr_byte(where) != NULL_POSITION);
+ case 'c':
+ return (hshift != 0);
+ case 'e': /* At end of file? */
+ return (eof_displayed());
+ case 'f': /* Filename known? */
+ return (strcmp(get_filename(curr_ifile), "-") != 0);
+ case 'l': /* Line number known? */
+ case 'd': /* Same as l */
+ return (linenums);
+ case 'L': /* Final line number known? */
+ case 'D': /* Final page number known? */
+ return (linenums && ch_length() != NULL_POSITION);
+ case 'm': /* More than one file? */
+#if TAGS
+ return (ntags() ? (ntags() > 1) : (nifile() > 1));
+#else
+ return (nifile() > 1);
+#endif
+ case 'n': /* First prompt in a new file? */
+#if TAGS
+ return (ntags() ? 1 : new_file);
+#else
+ return (new_file);
+#endif
+ case 'p': /* Percent into file (bytes) known? */
+ return (curr_byte(where) != NULL_POSITION &&
+ ch_length() > 0);
+ case 'P': /* Percent into file (lines) known? */
+ return (currline(where) != 0 &&
+ (len = ch_length()) > 0 &&
+ find_linenum(len) != 0);
+ case 's': /* Size of file known? */
+ case 'B':
+ return (ch_length() != NULL_POSITION);
+ case 'x': /* Is there a "next" file? */
+#if TAGS
+ if (ntags())
+ return (0);
+#endif
+ return (next_ifile(curr_ifile) != NULL_IFILE);
+ }
+ return (0);
+}
+
+/*
+ * Decode a "percent" prototype character.
+ * A prototype string may include various "percent" escapes;
+ * that is, a percent sign followed by a single letter.
+ * Here we decode that letter and take the appropriate action,
+ * usually by appending something to the message being built.
+ */
+ static void
+protochar(c, where, iseditproto)
+ int c;
+ int where;
+ int iseditproto;
+{
+ POSITION pos;
+ POSITION len;
+ int n;
+ LINENUM linenum;
+ LINENUM last_linenum;
+ IFILE h;
+
+#undef PAGE_NUM
+#define PAGE_NUM(linenum) ((((linenum) - 1) / (sc_height - 1)) + 1)
+
+ switch (c)
+ {
+ case 'b': /* Current byte offset */
+ pos = curr_byte(where);
+ if (pos != NULL_POSITION)
+ ap_pos(pos);
+ else
+ ap_quest();
+ break;
+ case 'c':
+ ap_int(hshift);
+ break;
+ case 'd': /* Current page number */
+ linenum = currline(where);
+ if (linenum > 0 && sc_height > 1)
+ ap_linenum(PAGE_NUM(linenum));
+ else
+ ap_quest();
+ break;
+ case 'D': /* Final page number */
+ /* Find the page number of the last byte in the file (len-1). */
+ len = ch_length();
+ if (len == NULL_POSITION)
+ ap_quest();
+ else if (len == 0)
+ /* An empty file has no pages. */
+ ap_linenum(0);
+ else
+ {
+ linenum = find_linenum(len - 1);
+ if (linenum <= 0)
+ ap_quest();
+ else
+ ap_linenum(PAGE_NUM(linenum));
+ }
+ break;
+#if EDITOR
+ case 'E': /* Editor name */
+ ap_str(editor);
+ break;
+#endif
+ case 'f': /* File name */
+ ap_str(get_filename(curr_ifile));
+ break;
+ case 'F': /* Last component of file name */
+ ap_str(last_component(get_filename(curr_ifile)));
+ break;
+ case 'i': /* Index into list of files */
+#if TAGS
+ if (ntags())
+ ap_int(curr_tag());
+ else
+#endif
+ ap_int(get_index(curr_ifile));
+ break;
+ case 'l': /* Current line number */
+ linenum = currline(where);
+ if (linenum != 0)
+ ap_linenum(linenum);
+ else
+ ap_quest();
+ break;
+ case 'L': /* Final line number */
+ len = ch_length();
+ if (len == NULL_POSITION || len == ch_zero() ||
+ (linenum = find_linenum(len)) <= 0)
+ ap_quest();
+ else
+ ap_linenum(linenum-1);
+ break;
+ case 'm': /* Number of files */
+#if TAGS
+ n = ntags();
+ if (n)
+ ap_int(n);
+ else
+#endif
+ ap_int(nifile());
+ break;
+ case 'p': /* Percent into file (bytes) */
+ pos = curr_byte(where);
+ len = ch_length();
+ if (pos != NULL_POSITION && len > 0)
+ ap_int(percentage(pos,len));
+ else
+ ap_quest();
+ break;
+ case 'P': /* Percent into file (lines) */
+ linenum = currline(where);
+ if (linenum == 0 ||
+ (len = ch_length()) == NULL_POSITION || len == ch_zero() ||
+ (last_linenum = find_linenum(len)) <= 0)
+ ap_quest();
+ else
+ ap_int(percentage(linenum, last_linenum));
+ break;
+ case 's': /* Size of file */
+ case 'B':
+ len = ch_length();
+ if (len != NULL_POSITION)
+ ap_pos(len);
+ else
+ ap_quest();
+ break;
+ case 't': /* Truncate trailing spaces in the message */
+ while (mp > message && mp[-1] == ' ')
+ mp--;
+ *mp = '\0';
+ break;
+ case 'T': /* Type of list */
+#if TAGS
+ if (ntags())
+ ap_str("tag");
+ else
+#endif
+ ap_str("file");
+ break;
+ case 'x': /* Name of next file */
+ h = next_ifile(curr_ifile);
+ if (h != NULL_IFILE)
+ ap_str(get_filename(h));
+ else
+ ap_quest();
+ break;
+ }
+}
+
+/*
+ * Skip a false conditional.
+ * When a false condition is found (either a false IF or the ELSE part
+ * of a true IF), this routine scans the prototype string to decide
+ * where to resume parsing the string.
+ * We must keep track of nested IFs and skip them properly.
+ */
+ static char *
+skipcond(p)
+ register char *p;
+{
+ register int iflevel;
+
+ /*
+ * We came in here after processing a ? or :,
+ * so we start nested one level deep.
+ */
+ iflevel = 1;
+
+ for (;;) switch (*++p)
+ {
+ case '?':
+ /*
+ * Start of a nested IF.
+ */
+ iflevel++;
+ break;
+ case ':':
+ /*
+ * Else.
+ * If this matches the IF we came in here with,
+ * then we're done.
+ */
+ if (iflevel == 1)
+ return (p);
+ break;
+ case '.':
+ /*
+ * Endif.
+ * If this matches the IF we came in here with,
+ * then we're done.
+ */
+ if (--iflevel == 0)
+ return (p);
+ break;
+ case '\\':
+ /*
+ * Backslash escapes the next character.
+ */
+ ++p;
+ break;
+ case '\0':
+ /*
+ * Whoops. Hit end of string.
+ * This is a malformed conditional, but just treat it
+ * as if all active conditionals ends here.
+ */
+ return (p-1);
+ }
+ /*NOTREACHED*/
+}
+
+/*
+ * Decode a char that represents a position on the screen.
+ */
+ static char *
+wherechar(p, wp)
+ char *p;
+ int *wp;
+{
+ switch (*p)
+ {
+ case 'b': case 'd': case 'l': case 'p': case 'P':
+ switch (*++p)
+ {
+ case 't': *wp = TOP; break;
+ case 'm': *wp = MIDDLE; break;
+ case 'b': *wp = BOTTOM; break;
+ case 'B': *wp = BOTTOM_PLUS_ONE; break;
+ case 'j': *wp = adjsline(jump_sline); break;
+ default: *wp = TOP; p--; break;
+ }
+ }
+ return (p);
+}
+
+/*
+ * Construct a message based on a prototype string.
+ */
+ public char *
+pr_expand(proto, maxwidth)
+ char *proto;
+ int maxwidth;
+{
+ register char *p;
+ register int c;
+ int where;
+
+ mp = message;
+
+ if (*proto == '\0')
+ return ("");
+
+ for (p = proto; *p != '\0'; p++)
+ {
+ switch (*p)
+ {
+ default: /* Just put the character in the message */
+ ap_char(*p);
+ break;
+ case '\\': /* Backslash escapes the next character */
+ p++;
+ ap_char(*p);
+ break;
+ case '?': /* Conditional (IF) */
+ if ((c = *++p) == '\0')
+ --p;
+ else
+ {
+ where = 0;
+ p = wherechar(p, &where);
+ if (!cond(c, where))
+ p = skipcond(p);
+ }
+ break;
+ case ':': /* ELSE */
+ p = skipcond(p);
+ break;
+ case '.': /* ENDIF */
+ break;
+ case '%': /* Percent escape */
+ if ((c = *++p) == '\0')
+ --p;
+ else
+ {
+ where = 0;
+ p = wherechar(p, &where);
+ protochar(c, where,
+#if EDITOR
+ (proto == editproto));
+#else
+ 0);
+#endif
+
+ }
+ break;
+ }
+ }
+
+ if (mp == message)
+ return ("");
+ if (maxwidth > 0 && mp >= message + maxwidth)
+ {
+ /*
+ * Message is too long.
+ * Return just the final portion of it.
+ */
+ return (mp - maxwidth);
+ }
+ return (message);
+}
+
+/*
+ * Return a message suitable for printing by the "=" command.
+ */
+ public char *
+eq_message()
+{
+ return (pr_expand(eqproto, 0));
+}
+
+/*
+ * Return a prompt.
+ * This depends on the prompt type (SHORT, MEDIUM, LONG), etc.
+ * If we can't come up with an appropriate prompt, return NULL
+ * and the caller will prompt with a colon.
+ */
+ public char *
+pr_string()
+{
+ char *prompt;
+ int type;
+
+ type = (!less_is_more) ? pr_type : pr_type ? 0 : 1;
+ prompt = pr_expand((ch_getflags() & CH_HELPFILE) ?
+ hproto : prproto[type],
+ sc_width-so_s_width-so_e_width-2);
+ new_file = 0;
+ return (prompt);
+}
+
+/*
+ * Return a message suitable for printing while waiting in the F command.
+ */
+ public char *
+wait_message()
+{
+ return (pr_expand(wproto, sc_width-so_s_width-so_e_width-2));
+}
projects / apitrace / blobdiff