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util.c
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C/C++ Source or Header
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1996-09-28
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726 lines
/************************************************************************
* This program is Copyright (C) 1986-1996 by Jonathan Payne. JOVE is *
* provided to you without charge, and with no warranty. You may give *
* away copies of JOVE, including sources, provided that this notice is *
* included in all the files. *
************************************************************************/
#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;
}
char *
filename(b)
register 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;
{
if (line == curline)
return linebuf;
else
return 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 char *s1,
*s2;
{
register int count = 0;
while (*s1 != '\0' && *s1++ == *s2++)
count += 1;
return count;
}
#ifdef FILENAME_CASEINSENSITIVE
int
numcompcase(s1, s2)
register 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;
{
char *val;
if (str == NULL)
return NULL;
val = emalloc((size_t) (strlen(str) + 1));
strcpy(val, str);
return val;
}
#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)
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 file F. */
char *
basename(f)
register 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;
}
}
void
null_ncpy(to, from, n)
char *to;
const char *from;
size_t n;
{
(void) strncpy(to, from, n);
to[n] = '\0';
}
bool
sindex(pattern, string)
register 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;
{
if (errnum > 0 && errnum < sys_nerr)
return(sys_errlist[errnum]);
return 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;
}