mirror of https://github.com/GnoConsortium/gno.git
445 lines
8.8 KiB
C
445 lines
8.8 KiB
C
/*
|
|
* 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.
|
|
*/
|
|
#pragma noroot
|
|
#include <stdio.h>
|
|
|
|
#include "less.h"
|
|
#include "position.h"
|
|
|
|
#ifdef _ORCAC_
|
|
segment "LoadSegONE";
|
|
#endif
|
|
|
|
extern int pr_type;
|
|
extern int hit_eof;
|
|
extern int new_file;
|
|
extern int sc_width;
|
|
extern int so_s_width, so_e_width;
|
|
extern int linenums;
|
|
extern int sc_height;
|
|
extern int jump_sline;
|
|
extern IFILE curr_ifile;
|
|
#if EDITOR
|
|
extern char *editor;
|
|
#endif
|
|
|
|
/*
|
|
* Prototypes for the three flavors of prompts.
|
|
* These strings are expanded by pr_expand().
|
|
*/
|
|
static char s_proto[] =
|
|
"?n?f%f .?m(file %i of %m) ..?e(END) ?x- Next\\: %x..%t";
|
|
static char m_proto[] =
|
|
"?n?f%f .?m(file %i of %m) ..?e(END) ?x- Next\\: %x.:?pB%pB\\%:byte %bB?s/%s...%t";
|
|
static char M_proto[] =
|
|
"?f%f .?n?m(file %i of %m) ..?ltline %lt?L/%L. :byte %bB?s/%s. .?e(END) ?x- Next\\: %x.:?pB%pB\\%..%t";
|
|
static char e_proto[] =
|
|
"?f%f .?m(file %i of %m) .?ltline %lt?L/%L. .byte %bB?s/%s. ?e(END) :?pB%pB\\%..%t";
|
|
|
|
public char *prproto[3];
|
|
public char *eqproto = e_proto;
|
|
|
|
static char message[250];
|
|
static char *mp;
|
|
|
|
static void setmp(void);
|
|
static void ap_pos(POSITION pos);
|
|
static void ap_int(int n);
|
|
static void ap_str(char *s);
|
|
static void ap_quest(void);
|
|
static POSITION curr_byte(int where);
|
|
static int cond(char c, int where);
|
|
static void protochar(int c, int where);
|
|
static char *skipcond(char *p);
|
|
static char *wherechar(char *p, int *wp);
|
|
|
|
/*
|
|
* Initialize the prompt prototype strings.
|
|
*/
|
|
public void
|
|
init_prompt(void)
|
|
{
|
|
prproto[0] = save(s_proto);
|
|
prproto[1] = save(m_proto);
|
|
prproto[2] = save(M_proto);
|
|
eqproto = save(e_proto);
|
|
}
|
|
|
|
/*
|
|
* Set the message pointer to the end of the message string.
|
|
*/
|
|
static void
|
|
setmp(void)
|
|
{
|
|
while (*mp != '\0')
|
|
mp++;
|
|
}
|
|
|
|
/*
|
|
* Append a POSITION (as a decimal integer) to the end of the message.
|
|
*/
|
|
static void
|
|
ap_pos(pos)
|
|
POSITION pos;
|
|
{
|
|
sprintf(mp, "%ld", (long)pos);
|
|
setmp();
|
|
}
|
|
|
|
/*
|
|
* Append an integer to the end of the message.
|
|
*/
|
|
static void
|
|
ap_int(n)
|
|
int n;
|
|
{
|
|
sprintf(mp, "%d", n);
|
|
setmp();
|
|
}
|
|
|
|
/*
|
|
* Append a string to the end of the message.
|
|
*/
|
|
static void
|
|
ap_str(s)
|
|
char *s;
|
|
{
|
|
strtcpy(mp, s, (unsigned int)(&message[sizeof(message)] - mp));
|
|
setmp();
|
|
}
|
|
|
|
/*
|
|
* Append a question mark to the end of the message.
|
|
*/
|
|
static void
|
|
ap_quest()
|
|
{
|
|
*mp++ = '?';
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
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;
|
|
{
|
|
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 'e': /* At end of file? */
|
|
return (hit_eof);
|
|
case 'f': /* Filename known? */
|
|
return (strcmp(get_filename(curr_ifile), "-") != 0);
|
|
case 'l': /* Line number known? */
|
|
return (linenums);
|
|
case 'L': /* Final line number known? */
|
|
return (linenums && ch_length() != NULL_POSITION);
|
|
case 'm': /* More than one file? */
|
|
return (nifile() > 1);
|
|
case 'n': /* First prompt in a new file? */
|
|
return (new_file);
|
|
case 'p': /* Percent into file known? */
|
|
return (curr_byte(where) != NULL_POSITION &&
|
|
ch_length() > 0);
|
|
case 's': /* Size of file known? */
|
|
case 'B':
|
|
return (ch_length() != NULL_POSITION);
|
|
case 'x': /* Is there a "next" file? */
|
|
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)
|
|
int c;
|
|
int where;
|
|
{
|
|
POSITION pos;
|
|
POSITION len;
|
|
int n;
|
|
IFILE h;
|
|
|
|
switch (c)
|
|
{
|
|
case 'b': /* Current byte offset */
|
|
pos = curr_byte(where);
|
|
if (pos != NULL_POSITION)
|
|
ap_pos(pos);
|
|
else
|
|
ap_quest();
|
|
break;
|
|
#if EDITOR
|
|
case 'E': /* Editor name */
|
|
ap_str(editor);
|
|
break;
|
|
#endif
|
|
case 'f': /* File name */
|
|
ap_str(get_filename(curr_ifile));
|
|
break;
|
|
case 'i': /* Index into list of files */
|
|
ap_int(get_index(curr_ifile));
|
|
break;
|
|
case 'l': /* Current line number */
|
|
n = currline(where);
|
|
if (n != 0)
|
|
ap_int(n);
|
|
else
|
|
ap_quest();
|
|
break;
|
|
case 'L': /* Final line number */
|
|
len = ch_length();
|
|
if (len == NULL_POSITION || len == ch_zero() ||
|
|
(n = find_linenum(len)) <= 0)
|
|
ap_quest();
|
|
else
|
|
ap_int(n-1);
|
|
break;
|
|
case 'm': /* Number of files */
|
|
ap_int(nifile());
|
|
break;
|
|
case 'p': /* Percent into file */
|
|
pos = curr_byte(where);
|
|
len = ch_length();
|
|
if (pos != NULL_POSITION && len > 0)
|
|
/*
|
|
* {{ This calculation may overflow! }}
|
|
*/
|
|
ap_int((int)(100*pos / len));
|
|
else
|
|
ap_quest();
|
|
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--;
|
|
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*/
|
|
}
|
|
|
|
static char *
|
|
wherechar(p, wp)
|
|
char *p;
|
|
int *wp;
|
|
{
|
|
switch (*p)
|
|
{
|
|
case 'b': case 'l': 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 */
|
|
*mp++ = *p;
|
|
break;
|
|
case '\\': /* Backslash escapes the next character */
|
|
p++;
|
|
*mp++ = *p;
|
|
break;
|
|
case '?': /* Conditional (IF) */
|
|
if ((c = *++p) == '\0')
|
|
--p;
|
|
else
|
|
{
|
|
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
|
|
{
|
|
p = wherechar(p, &where);
|
|
protochar(c, where);
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
new_file = 0;
|
|
if (mp == message)
|
|
return (NULL);
|
|
*mp = '\0';
|
|
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(void)
|
|
{
|
|
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(void)
|
|
{
|
|
return (pr_expand(prproto[pr_type], sc_width-so_s_width-so_e_width-2));
|
|
}
|