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0f05e53f99
uemacs/input.c
Pekka Enberg 0f05e53f99 uemacs: Fix return statements 
Return statement is not a function so remove superfluous use of parenthesis.

Cc: Thiago Farina <tfransosi@gmail.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-08-29 08:15:23 -07:00

720 lines
14 KiB
C
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/* INPUT.C
*
* Various input routines
*
* written by Daniel Lawrence 5/9/86
* modified by Petri Kutvonen
*/
#include <stdio.h>
#include <unistd.h>
#include "estruct.h"
#include "edef.h"
#include "efunc.h"
#if PKCODE
#if MSDOS && TURBO
#include <dir.h>
#endif
#endif
#if PKCODE && (UNIX || (MSDOS && TURBO))
#define COMPLC 1
#else
#define COMPLC 0
#endif
/*
* Ask a yes or no question in the message line. Return either TRUE, FALSE, or
* ABORT. The ABORT status is returned if the user bumps out of the question
* with a ^G. Used any time a confirmation is required.
*/
int mlyesno(char *prompt)
{
char c; /* input character */
char buf[NPAT]; /* prompt to user */
for (;;) {
/* build and prompt the user */
strcpy(buf, prompt);
strcat(buf, " (y/n)? ");
mlwrite(buf);
/* get the responce */
c = tgetc();
if (c == ectoc(abortc)) /* Bail out! */
return ABORT;
if (c == 'y' || c == 'Y')
return TRUE;
if (c == 'n' || c == 'N')
return FALSE;
}
}
/*
* Write a prompt into the message line, then read back a response. Keep
* track of the physical position of the cursor. If we are in a keyboard
* macro throw the prompt away, and return the remembered response. This
* lets macros run at full speed. The reply is always terminated by a carriage
* return. Handle erase, kill, and abort keys.
*/
int mlreply(char *prompt, char *buf, int nbuf)
{
return nextarg(prompt, buf, nbuf, ctoec('\n'));
}
int mlreplyt(char *prompt, char *buf, int nbuf, int eolchar)
{
return nextarg(prompt, buf, nbuf, eolchar);
}
/*
* ectoc:
* expanded character to character
* collapse the CONTROL and SPEC flags back into an ascii code
*/
int ectoc(int c)
{
if (c & CONTROL)
c = c & ~(CONTROL | 0x40);
if (c & SPEC)
c = c & 255;
return c;
}
/*
* ctoec:
* character to extended character
* pull out the CONTROL and SPEC prefixes (if possible)
*/
int ctoec(int c)
{
if (c >= 0x00 && c <= 0x1F)
c = CONTROL | (c + '@');
return c;
}
/*
* get a command name from the command line. Command completion means
* that pressing a <SPACE> will attempt to complete an unfinished command
* name if it is unique.
*/
fn_t getname(void)
{
int cpos; /* current column on screen output */
int c;
char *sp; /* pointer to string for output */
struct name_bind *ffp; /* first ptr to entry in name binding table */
struct name_bind *cffp; /* current ptr to entry in name binding table */
struct name_bind *lffp; /* last ptr to entry in name binding table */
char buf[NSTRING]; /* buffer to hold tentative command name */
/* starting at the beginning of the string buffer */
cpos = 0;
/* if we are executing a command line get the next arg and match it */
if (clexec) {
if (macarg(buf) != TRUE)
return NULL;
return fncmatch(&buf[0]);
}
/* build a name string from the keyboard */
while (TRUE) {
c = tgetc();
/* if we are at the end, just match it */
if (c == 0x0d) {
buf[cpos] = 0;
/* and match it off */
return fncmatch(&buf[0]);
} else if (c == ectoc(abortc)) { /* Bell, abort */
ctrlg(FALSE, 0);
TTflush();
return NULL;
} else if (c == 0x7F || c == 0x08) { /* rubout/erase */
if (cpos != 0) {
TTputc('\b');
TTputc(' ');
TTputc('\b');
--ttcol;
--cpos;
TTflush();
}
} else if (c == 0x15) { /* C-U, kill */
while (cpos != 0) {
TTputc('\b');
TTputc(' ');
TTputc('\b');
--cpos;
--ttcol;
}
TTflush();
} else if (c == ' ' || c == 0x1b || c == 0x09) {
/* <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< */
/* attempt a completion */
buf[cpos] = 0; /* terminate it for us */
ffp = &names[0]; /* scan for matches */
while (ffp->n_func != NULL) {
if (strncmp(buf, ffp->n_name, strlen(buf))
== 0) {
/* a possible match! More than one? */
if ((ffp + 1)->n_func == NULL ||
(strncmp
(buf, (ffp + 1)->n_name,
strlen(buf)) != 0)) {
/* no...we match, print it */
sp = ffp->n_name + cpos;
while (*sp)
TTputc(*sp++);
TTflush();
return ffp->n_func;
} else {
/* << << << << << << << << << << << << << << << << << */
/* try for a partial match against the list */
/* first scan down until we no longer match the current input */
lffp = (ffp + 1);
while ((lffp +
1)->n_func !=
NULL) {
if (strncmp
(buf,
(lffp +
1)->n_name,
strlen(buf))
!= 0)
break;
++lffp;
}
/* and now, attempt to partial complete the string, char at a time */
while (TRUE) {
/* add the next char in */
buf[cpos] =
ffp->
n_name[cpos];
/* scan through the candidates */
cffp = ffp + 1;
while (cffp <=
lffp) {
if (cffp->
n_name
[cpos]
!=
buf
[cpos])
goto onward;
++cffp;
}
/* add the character */
TTputc(buf
[cpos++]);
}
/* << << << << << << << << << << << << << << << << << */
}
}
++ffp;
}
/* no match.....beep and onward */
TTbeep();
onward:;
TTflush();
/* <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< */
} else {
if (cpos < NSTRING - 1 && c > ' ') {
buf[cpos++] = c;
TTputc(c);
}
++ttcol;
TTflush();
}
}
}
/* tgetc: Get a key from the terminal driver, resolve any keyboard
macro action */
int tgetc(void)
{
int c; /* fetched character */
/* if we are playing a keyboard macro back, */
if (kbdmode == PLAY) {
/* if there is some left... */
if (kbdptr < kbdend)
return (int) *kbdptr++;
/* at the end of last repitition? */
if (--kbdrep < 1) {
kbdmode = STOP;
#if VISMAC == 0
/* force a screen update after all is done */
update(FALSE);
#endif
} else {
/* reset the macro to the begining for the next rep */
kbdptr = &kbdm[0];
return (int) *kbdptr++;
}
}
/* fetch a character from the terminal driver */
c = TTgetc();
/* record it for $lastkey */
lastkey = c;
/* save it if we need to */
if (kbdmode == RECORD) {
*kbdptr++ = c;
kbdend = kbdptr;
/* don't overrun the buffer */
if (kbdptr == &kbdm[NKBDM - 1]) {
kbdmode = STOP;
TTbeep();
}
}
/* and finally give the char back */
return c;
}
/* GET1KEY: Get one keystroke. The only prefixs legal here
are the SPEC and CONTROL prefixes.
*/
int get1key(void)
{
int c;
/* get a keystroke */
c = tgetc();
#if MSDOS
if (c == 0) { /* Apply SPEC prefix */
c = tgetc();
if (c >= 0x00 && c <= 0x1F) /* control key? */
c = CONTROL | (c + '@');
return SPEC | c;
}
#endif
if (c >= 0x00 && c <= 0x1F) /* C0 control -> C- */
c = CONTROL | (c + '@');
return c;
}
/* GETCMD: Get a command from the keyboard. Process all applicable
prefix keys
*/
int getcmd(void)
{
int c; /* fetched keystroke */
#if VT220
int d; /* second character P.K. */
int cmask = 0;
#endif
/* get initial character */
c = get1key();
#if VT220
proc_metac:
#endif
if (c == 128+27) /* CSI */
goto handle_CSI;
/* process META prefix */
if (c == (CONTROL | '[')) {
c = get1key();
#if VT220
if (c == '[' || c == 'O') { /* CSI P.K. */
handle_CSI:
c = get1key();
if (c >= 'A' && c <= 'D')
return SPEC | c | cmask;
if (c >= 'E' && c <= 'z' && c != 'i' && c != 'c')
return SPEC | c | cmask;
d = get1key();
if (d == '~') /* ESC [ n ~ P.K. */
return SPEC | c | cmask;
switch (c) { /* ESC [ n n ~ P.K. */
case '1':
c = d + 32;
break;
case '2':
c = d + 48;
break;
case '3':
c = d + 64;
break;
default:
c = '?';
break;
}
if (d != '~') /* eat tilde P.K. */
get1key();
if (c == 'i') { /* DO key P.K. */
c = ctlxc;
goto proc_ctlxc;
} else if (c == 'c') /* ESC key P.K. */
c = get1key();
else
return SPEC | c | cmask;
}
#endif
#if VT220
if (c == (CONTROL | '[')) {
cmask = META;
goto proc_metac;
}
#endif
if (islower(c)) /* Force to upper */
c ^= DIFCASE;
if (c >= 0x00 && c <= 0x1F) /* control key */
c = CONTROL | (c + '@');
return META | c;
}
#if PKCODE
else if (c == metac) {
c = get1key();
#if VT220
if (c == (CONTROL | '[')) {
cmask = META;
goto proc_metac;
}
#endif
if (islower(c)) /* Force to upper */
c ^= DIFCASE;
if (c >= 0x00 && c <= 0x1F) /* control key */
c = CONTROL | (c + '@');
return META | c;
}
#endif
#if VT220
proc_ctlxc:
#endif
/* process CTLX prefix */
if (c == ctlxc) {
c = get1key();
#if VT220
if (c == (CONTROL | '[')) {
cmask = CTLX;
goto proc_metac;
}
#endif
if (c >= 'a' && c <= 'z') /* Force to upper */
c -= 0x20;
if (c >= 0x00 && c <= 0x1F) /* control key */
c = CONTROL | (c + '@');
return CTLX | c;
}
/* otherwise, just return it */
return c;
}
/* A more generalized prompt/reply function allowing the caller
to specify the proper terminator. If the terminator is not
a return ('\n') it will echo as "<NL>"
*/
int getstring(char *prompt, char *buf, int nbuf, int eolchar)
{
int cpos; /* current character position in string */
int c;
int quotef; /* are we quoting the next char? */
#if COMPLC
int ffile, ocpos, nskip = 0, didtry = 0;
#if MSDOS
struct ffblk ffblk;
char *fcp;
#endif
#if UNIX
static char tmp[] = "/tmp/meXXXXXX";
FILE *tmpf = NULL;
#endif
ffile = (strcmp(prompt, "Find file: ") == 0
|| strcmp(prompt, "View file: ") == 0
|| strcmp(prompt, "Insert file: ") == 0
|| strcmp(prompt, "Write file: ") == 0
|| strcmp(prompt, "Read file: ") == 0
|| strcmp(prompt, "File to execute: ") == 0);
#endif
cpos = 0;
quotef = FALSE;
/* prompt the user for the input string */
mlwrite(prompt);
for (;;) {
#if COMPLC
if (!didtry)
nskip = -1;
didtry = 0;
#endif
/* get a character from the user */
c = get1key();
/* If it is a <ret>, change it to a <NL> */
#if PKCODE
if (c == (CONTROL | 0x4d) && !quotef)
#else
if (c == (CONTROL | 0x4d))
#endif
c = CONTROL | 0x40 | '\n';
/* if they hit the line terminate, wrap it up */
if (c == eolchar && quotef == FALSE) {
buf[cpos++] = 0;
/* clear the message line */
mlwrite("");
TTflush();
/* if we default the buffer, return FALSE */
if (buf[0] == 0)
return FALSE;
return TRUE;
}
/* change from command form back to character form */
c = ectoc(c);
if (c == ectoc(abortc) && quotef == FALSE) {
/* Abort the input? */
ctrlg(FALSE, 0);
TTflush();
return ABORT;
} else if ((c == 0x7F || c == 0x08) && quotef == FALSE) {
/* rubout/erase */
if (cpos != 0) {
outstring("\b \b");
--ttcol;
if (buf[--cpos] < 0x20) {
outstring("\b \b");
--ttcol;
}
if (buf[cpos] == '\n') {
outstring("\b\b \b\b");
ttcol -= 2;
}
TTflush();
}
} else if (c == 0x15 && quotef == FALSE) {
/* C-U, kill */
while (cpos != 0) {
outstring("\b \b");
--ttcol;
if (buf[--cpos] < 0x20) {
outstring("\b \b");
--ttcol;
}
if (buf[cpos] == '\n') {
outstring("\b\b \b\b");
ttcol -= 2;
}
}
TTflush();
#if COMPLC
} else if ((c == 0x09 || c == ' ') && quotef == FALSE
&& ffile) {
/* TAB, complete file name */
char ffbuf[255];
#if MSDOS
char sffbuf[128];
int lsav = -1;
#endif
int n, iswild = 0;
didtry = 1;
ocpos = cpos;
while (cpos != 0) {
outstring("\b \b");
--ttcol;
if (buf[--cpos] < 0x20) {
outstring("\b \b");
--ttcol;
}
if (buf[cpos] == '\n') {
outstring("\b\b \b\b");
ttcol -= 2;
}
if (buf[cpos] == '*' || buf[cpos] == '?')
iswild = 1;
#if MSDOS
if (lsav < 0 && (buf[cpos] == '\\' ||
buf[cpos] == '/' ||
buf[cpos] == ':'
&& cpos == 1))
lsav = cpos;
#endif
}
TTflush();
if (nskip < 0) {
buf[ocpos] = 0;
#if UNIX
if (tmpf != NULL)
fclose(tmpf);
strcpy(tmp, "/tmp/meXXXXXX");
strcpy(ffbuf, "echo ");
strcat(ffbuf, buf);
if (!iswild)
strcat(ffbuf, "*");
strcat(ffbuf, " >");
mkstemp(tmp);
strcat(ffbuf, tmp);
strcat(ffbuf, " 2>&1");
system(ffbuf);
tmpf = fopen(tmp, "r");
#endif
#if MSDOS
strcpy(sffbuf, buf);
if (!iswild)
strcat(sffbuf, "*.*");
#endif
nskip = 0;
}
#if UNIX
c = ' ';
for (n = nskip; n > 0; n--)
while ((c = getc(tmpf)) != EOF
&& c != ' ');
#endif
#if MSDOS
if (nskip == 0) {
strcpy(ffbuf, sffbuf);
c = findfirst(ffbuf, &ffblk,
FA_DIREC) ? '*' : ' ';
} else if (nskip > 0)
c = findnext(&ffblk) ? 0 : ' ';
#endif
nskip++;
if (c != ' ') {
TTbeep();
nskip = 0;
}
#if UNIX
while ((c = getc(tmpf)) != EOF && c != '\n'
&& c != ' ' && c != '*')
#endif
#if MSDOS
if (c == '*')
fcp = sffbuf;
else {
strncpy(buf, sffbuf, lsav + 1);
cpos = lsav + 1;
fcp = ffblk.ff_name;
}
while (c != 0 && (c = *fcp++) != 0 && c != '*')
#endif
{
if (cpos < nbuf - 1)
buf[cpos++] = c;
}
#if UNIX
if (c == '*')
TTbeep();
#endif
for (n = 0; n < cpos; n++) {
c = buf[n];
if ((c < ' ') && (c != '\n')) {
outstring("^");
++ttcol;
c ^= 0x40;
}
if (c != '\n') {
if (disinp)
TTputc(c);
} else { /* put out <NL> for <ret> */
outstring("<NL>");
ttcol += 3;
}
++ttcol;
}
TTflush();
#if UNIX
rewind(tmpf);
unlink(tmp);
#endif
#endif
} else if ((c == quotec || c == 0x16) && quotef == FALSE) {
quotef = TRUE;
} else {
quotef = FALSE;
if (cpos < nbuf - 1) {
buf[cpos++] = c;
if ((c < ' ') && (c != '\n')) {
outstring("^");
++ttcol;
c ^= 0x40;
}
if (c != '\n') {
if (disinp)
TTputc(c);
} else { /* put out <NL> for <ret> */
outstring("<NL>");
ttcol += 3;
}
++ttcol;
TTflush();
}
}
}
}
/*
* output a string of characters
*
* char *s; string to output
*/
void outstring(char *s)
{
if (disinp)
while (*s)
TTputc(*s++);
}
/*
* output a string of output characters
*
* char *s; string to output
*/
void ostring(char *s)
{
if (discmd)
while (*s)
TTputc(*s++);
}
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