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/**************************************************************************
* This program is Copyright (C) 1986-2002 by Jonathan Payne. JOVE is *
* provided by Jonathan and Jovehacks without charge and without *
* warranty. You may copy, modify, and/or distribute JOVE, provided that *
* this notice is included in all the source files and documentation. *
**************************************************************************/
#include "jove.h"
#include <errno.h>
#include "jctype.h"
#include "disp.h"
#include "fp.h"
#include "ask.h"
#include "chars.h"
#include "fmt.h"
#include "insert.h"
#include "macros.h"
#include "marks.h"
#include "move.h"
#include "rec.h"
#ifdef MAC
# include "mac.h"
#endif
bool
blnkp(buf)
register char *buf;
{
register char c;
do {
c = *buf++;
} while (jiswhite(c));
return c == '\0'; /* It's NUL if we got to the end of the Line */
}
bool
within_indent()
{
register int i;
i = curchar;
for (;;) {
if (--i < 0)
return YES;
if (!jiswhite(linebuf[i]))
return NO;
}
}
void
DotTo(line, col)
LinePtr line;
int col;
{
Bufpos bp;
bp.p_line = line;
bp.p_char = col;
SetDot(&bp);
}
/* If bp->p_line is != current line, then save current line. Then set dot
* to bp->p_line, and if they weren't equal get that line into linebuf.
*/
void
SetDot(bp)
register Bufpos *bp;
{
register bool notequal;
if (bp == NULL)
return;
notequal = bp->p_line != curline;
if (notequal)
lsave();
if (bp->p_line != NULL)
curline = bp->p_line;
if (notequal)
getDOT();
curchar = bp->p_char;
if (curchar > length(curline))
curchar = length(curline);
}
void
ToLast()
{
SetLine(curbuf->b_last);
Eol();
}
int MarkThresh = 22; /* VAR: moves greater than MarkThresh will SetMark (avg screen size) */
private int line_diff;
int
inorder(nextp, char1, endp, char2)
register LinePtr nextp,
endp;
int char1,
char2;
{
register LinePtr prevp = nextp;
line_diff = 0;
if (nextp == endp)
return char1 < char2;
while (nextp && prevp) {
nextp = nextp->l_next;
prevp = prevp->l_prev;
line_diff += 1;
if (nextp == endp)
return YES;
if (prevp == endp)
return NO;
}
while (nextp!=NULL && nextp!=endp) {
nextp = nextp->l_next;
line_diff += 1;
}
while (prevp!=NULL && prevp!=endp) {
prevp = prevp->l_prev;
line_diff += 1;
}
/* nextp == prevp implies both are NULL: the lines are not ordered */
return nextp==prevp? -1 : nextp==endp;
}
/* Number of lines (forward OR back) from nextp to endp.
* Note: if they are not related, returns 0.
*/
int
LineDist(nextp, endp)
LinePtr nextp,
endp;
{
return inorder(nextp, 0, endp, 0) == -1? 0 : line_diff;
}
/* Number of lines forward from "from" to "to"; -1 if not found.
* Note: if "to" is (LinePtr)NULL, returns number of lines to end + 1
*/
int
LinesTo(from, to)
register LinePtr
from,
to;
{
int n = 0;
for (;;) {
if (from == to)
return n;
if (from == NULL)
return -1;
n += 1;
from = from->l_next;
}
}
void
PushPntp(line)
register LinePtr line;
{
if (LineDist(curline, line) >= MarkThresh)
set_mark();
}
void
ToFirst()
{
SetLine(curbuf->b_first);
}
int
length(line)
LinePtr line;
{
return strlen(lcontents(line));
}
void
to_word(dir)
register int dir;
{
if (dir == FORWARD) {
for(;;) {
register ZXchar c = ZXC(linebuf[curchar]);
if (c == '\0') {
if (curline->l_next == NULL)
break; /* failure: out of buffer */
SetLine(curline->l_next);
} else if (jisword(c)) {
break; /* success */
} else {
curchar += 1;
}
}
} else {
for (;;) {
if (bolp()) {
if (curline->l_prev == NULL)
break; /* failure: out of buffer */
SetLine(curline->l_prev);
Eol();
} else if (jisword(linebuf[curchar - 1])) {
break; /* success */
} else {
curchar -= 1;
}
}
}
}
/* Are there any modified buffers? Allp means include B_PROCESS
* buffers in the check.
*/
bool
ModBufs(allp)
bool allp;
{
register Buffer *b;
for (b = world; b != NULL; b = b->b_next)
if (b->b_type != B_SCRATCH
&& (b->b_type == B_FILE || allp)
&& IsModified(b))
return YES;
return NO;
}
const char *
filename(b)
register const Buffer *b;
{
return b->b_fname ? pr_name(b->b_fname, YES) : "[No file]";
}
int
min(a, b)
register int a,
b;
{
return (a < b) ? a : b;
}
int
max(a, b)
register int a,
b;
{
return (a > b) ? a : b;
}
char *
lcontents(line)
register LinePtr line;
{
return line == curline? linebuf : lbptr(line);
}
char *
ltobuf(line, buf)
LinePtr line;
char *buf;
{
if (line == curline) {
if (buf != linebuf)
strcpy(buf, linebuf);
Jr_Len = strlen(linebuf);
} else
getline(line->l_dline, buf);
return buf;
}
void
DOTsave(buf)
Bufpos *buf;
{
buf->p_line = curline;
buf->p_char = curchar;
}
/* Return YES iff we had to rearrange the order. */
bool
fixorder(line1, char1, line2, char2)
register LinePtr *line1,
*line2;
register int *char1,
*char2;
{
LinePtr tline;
int tchar;
if (inorder(*line1, *char1, *line2, *char2))
return NO;
tline = *line1;
tchar = *char1;
*line1 = *line2;
*char1 = *char2;
*line2 = tline;
*char2 = tchar;
return YES;
}
bool
inlist(first, what)
LinePtr first,
what;
{
return LinesTo(first, what) != -1;
}
/* Make curbuf (un)modified and tell the redisplay code to update the modeline
* if it will need to be changed.
*/
void
modify()
{
if (!curbuf->b_modified) {
UpdModLine = YES;
curbuf->b_modified = YES;
}
DOLsave = YES;
#ifdef RECOVER
if (curbuf->b_type != B_SCRATCH)
ModCount += 1;
#endif
}
void
unmodify()
{
if (curbuf->b_modified) {
UpdModLine = YES;
curbuf->b_modified = NO;
}
}
/* Set or clear the divergence flag for `buf'.
* A buffer that contains a file is considered to have diverged
* if the file in the filesystem appears to have changed since the
* last time the buffer was loaded from or saved to that file.
* If the flag has changed, tell the redisplay code to update the
* modeline.
*/
void
diverge(buf, d)
Buffer *buf;
bool d;
{
if (buf->b_diverged != d) {
UpdModLine = YES;
buf->b_diverged = d;
}
}
int
numcomp(s1, s2)
register const char *s1,
*s2;
{
register int count = 0;
while (*s1 != '\0' && *s1++ == *s2++)
count += 1;
return count;
}
#ifdef FILENAME_CASEINSENSITIVE
int
numcompcase(s1, s2)
register const char *s1,
*s2;
{
register int count = 0;
while (*s1 != '\0' && CharDowncase(*s1++) == CharDowncase(*s2++))
count += 1;
return count;
}
#endif
char *
copystr(str)
const char *str;
{
return str == NULL? NULL :
strcpy(emalloc(strlen(str) + 1), str);
}
#ifndef byte_copy
void
byte_copy(from, to, count)
UnivConstPtr *from;
UnivPtr *to;
register size_t count;
{
register const char *p = from;
register char *q = to;
if (count != 0) {
do *q++ = *p++; while (--count != 0);
}
}
#endif
void
len_error(flag)
int flag;
{
static const char mesg[] = "[line too long]";
if (flag == JMP_COMPLAIN)
complain(mesg);
else
error(mesg);
}
/* Insert num copies of character c at offset atchar in buffer buf of size max */
void
ins_c(c, buf, atchar, num, max)
char c;
char *buf;
int atchar,
num,
max;
{
/* hint to reader: all copying and filling is done right to left */
register char *from, *to;
int taillen;
if (num <= 0)
return;
from = &buf[atchar];
taillen = *from == '\0'? 1 : strlen(from) + 1; /* include NUL */
if (atchar + taillen + num > max)
len_error(JMP_COMPLAIN);
from += taillen;
to = from + num;
do {
*--to = *--from;
} while (--taillen != 0);
while (to != from)
*--to = c;
}
bool
TwoBlank()
{
register LinePtr next = curline->l_next;
return (next != NULL
&& *(lcontents(next)) == '\0'
&& next->l_next != NULL
&& *(lcontents(next->l_next)) == '\0');
}
void
linecopy(onto, atchar, from)
register char *onto,
*from;
int atchar;
{
register char *endp = &onto[LBSIZE];
onto += atchar;
do {
if (onto >= endp)
len_error(JMP_ERROR);
} while ((*onto++ = *from++) != '\0');
}
char *
IOerr(err, file)
const char *err, *file;
{
return sprint("Couldn't %s \"%s\".", err, file);
}
#ifdef UNIX
void
dopipe(p)
int *p;
{
if (pipe(p) == -1)
complain("[Pipe failed: %s]", strerror(errno));
}
void
pipeclose(p)
int *p;
{
(void) close(p[0]);
(void) close(p[1]);
}
#endif /* UNIX */
/* NOSTRICT */
UnivPtr
emalloc(size)
size_t size;
{
register UnivPtr ptr;
if ((ptr = malloc(size)) == NULL) {
/* Try garbage collecting lines */
GCchunks();
if ((ptr = malloc(size)) == NULL) {
/* Uh ... Oh screw it! */
error("[Out of memory]");
/* NOTREACHED */
}
}
return ptr;
}
UnivPtr
erealloc(ptr, size)
UnivPtr ptr;
size_t size;
{
if (ptr == NULL) {
ptr = emalloc(size);
} else if ((ptr = realloc(ptr, size)) == NULL) {
/* no second chance for realloc! */
error("[out of memory]");
/* NOTREACHED */
}
return ptr;
}
/* Return the basename of pathname F.
*
* - System V release 4 includes a function named "basename" in libgen.
* It is incompatible with ours:
* + it strips trailing "/" characters (does this matter?)
* + although not clearly documented, this stripping modifies the argument!
* + it handles the NULL pointer and the null string as "."
*
* - LINUX also provides a basename
* + at least one version of Slackware puts the prototype in <unistd.h>
* so it cannot be ignored.
* + This LINUX prototype declares the parameter to be of const char *
* type. This is incompatible with ours and with SVR4's.
* + The fact that the argument is a pointer to const implies that
* the source string cannot be modified. Therefore trailing "/"
* characters are not stripped from the source.
* + Either stripping isn't done to the result OR the result must be
* placed in a distinct chunk of memory. How is this memory managed?
*
* To avoid conflict, we have renamed ours to "jbasename".
*/
const char *
jbasename(f)
register const char *f;
{
register char *cp;
#ifdef MSFILESYSTEM
if (f[0] != '\0' && f[1] == ':')
f += 2;
if ((cp = strrchr(f, '\\')) != NULL)
f = cp + 1;
#endif /* MSFILESYSTEM */
if ((cp = strrchr(f, '/')) != NULL)
f = cp + 1;
return f;
}
void
push_env(savejmp)
jmp_buf savejmp;
{
byte_copy((UnivPtr) mainjmp, (UnivPtr) savejmp, sizeof (jmp_buf));
}
void
pop_env(savejmp)
jmp_buf savejmp;
{
byte_copy((UnivPtr) savejmp, (UnivPtr) mainjmp, sizeof (jmp_buf));
}
/* get the time buf, designated by *timep, from FROM to TO. */
char *
get_time(timep, buf, from, to)
time_t *timep;
char *buf;
int from,
to;
{
time_t now;
char *cp;
if (timep != NULL)
now = *timep;
else
(void) time(&now);
cp = ctime(&now) + from;
if (to == -1)
cp[strlen(cp) - 1] = '\0'; /* Get rid of \n */
else
cp[to - from] = '\0';
if (buf) {
strcpy(buf, cp);
return buf;
} else {
return cp;
}
}
/* Are s1 and s2 equal, at least for the first n chars, ignoring case? */
bool
caseeqn(s1, s2, n)
register const char *s1,
*s2;
register size_t n;
{
if (s1==NULL || s2==NULL)
return NO;
for (;;) {
if (n == 0)
return YES;
n--;
if (!cind_eq(*s1, *s2++))
return NO;
if (*s1++ == '\0')
return YES;
}
}
/* copy a string into buffer; truncate silently if too large; NUL-pad.
* Note: buffer must be 1 larger than n to fit NUL!
* Duplicated in recover.c: needed by scandir.c
*/
void
null_ncpy(to, from, n)
char *to;
const char *from;
size_t n;
{
(void) strncpy(to, from, n);
to[n] = '\0';
}
/* Copy a string into a buffer; truncate silently if string is too large */
void
truncstrsub(buf, str, bufsz)
char *buf;
size_t bufsz;
const char *str;
{
if (strlen(str) < bufsz)
strcpy(buf, str);
else if (bufsz == 0)
complain("internal error"); /* cannot even fit NUL */
else {
strncpy(buf, str, bufsz - 1);
buf[bufsz-1] = '\0';
}
}
/* Copy a string into a buffer; complain if string is too large */
void
jamstrsub(buf, str, bufsz)
char *buf;
size_t bufsz;
const char *str;
{
if (strlen(str) < bufsz)
strcpy(buf, str);
else
complain("string too long");
}
bool
sindex(pattern, string)
register const char *pattern,
*string;
{
register size_t len = strlen(pattern);
if (len == 0)
return YES;
while (*string != '\0') {
if (*pattern == *string && strncmp(pattern, string, len) == 0)
return YES;
string += 1;
}
return NO;
}
/* Free, then allocate a block.
* Like erealloc, except that the previous contents of the block are lost.
*/
UnivPtr
freealloc(obj, size)
register UnivPtr obj;
size_t size;
{
if (obj != NULL)
obj = realloc(obj, size);
if (obj == NULL)
obj = emalloc(size);
return obj;
}
/* order file names (parameter for qsort) */
int
fnamecomp(a, b)
UnivConstPtr a,
b;
{
return strcmp(*(const char **)a, *(const char **)b);
}
#ifdef NO_STRERROR
extern int sys_nerr;
extern char *sys_errlist[];
/*
* Unix version of strerror - map error number to descriptive string.
* ANSI systems should have this.
*/
char *
strerror(errnum)
int errnum;
{
return 0 < errnum && errnum < sys_nerr
? sys_errlist[errnum] : sprint("Error number %d", errnum);
}
#endif /* NO_STRERROR */
/* decode a pair of characters representing \x or ^x */
ZXchar
DecodePair(first, second)
ZXchar first, second;
{
if (second == EOF || second == '\n')
complain("unexpected end of file after %p", first);
if (first == '^') {
if (second == '?') {
second = DEL;
} else {
ZXchar us = CharUpcase(second);
if (us < '@' || '_' < us)
complain("unknown control character %p", second);
second = CTL(us);
}
}
return second;
}
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