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The C Users' Group Library 1994 August
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wc-cdrom-cusersgrouplibrary-1994-08.iso
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vol_200
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208_01
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e4.c
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1987-10-13
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251 lines
/*
HEADER: CUG208;
TITLE: 'e' for CP/M68K
VERSION: 1.48+
DESCRIPTION: "a screen editor";
KEYWORDS: editor;
SYSTEM: CP/M68K, V1.2;
FILENAME: e/e4.c
WARNINGS: "the default value is for systems with 128K bytes
of memory or more";
SEE-ALSO: cpm68k.c, e68k.doc, CUG VOL 133;
AUTHORS: G.N.Gilbert('e'), J.W.Haefner(for DeSmet C on MSDOS and UNIX)
CODER: Yoshimasa Tsuji
COMPILERS: DRI C(Alcyon C) for CP/M68K;
*/
/*
FUNCTIONS: findorrep,dofindrep,find
PURPOSE: perform find, alter and repeat commands
*/
# include "e.h"
findorrep()
{
int toend, global, i, count;
char c, *p;
putmess("Find? ");
global=nocheck=toend=nocase=NO;
findir=1;
count=0;
c=scans(patt,FLIM);
if (replace) {
if (c == ESCKEY) return;
putmess("Alter to? ");
c=scans(changeto,FLIM);
}
else if (!patt[0]) return;
if (c == CR) {
if (replace)
putmess("B|ackwards/|G|lobally/|T|o end (start)/|I|gnore case/|W|ithout asking/number|? ");
else putmess("B|ackwards/|I|gnore case/number of times|? ");
if (scans(opts,5) == ESCKEY) return;
for (i=0; (c=opts[i]); i++) {
switch(tolower(c)) {
case 'g' :
global=YES;
case 't' :
toend=YES;
break;
case 'b' :
findir= -1;
break;
case 'w' :
nocheck=YES;
break;
case 'i' :
nocase=YES;
for (p=patt; *p; p++)
*p=tolower(*p);
break;
}
if (c >= '0' && c <= '9') count=count*10+c-'0';
}
if (!replace) {
global=NO;
toend=NO;
}
if (count == 0) {
if (toend) count=MAXINT;
else count=1;
}
if (global) {
findir=1;
moveline(1-cline);
sync(0);
}
}
else count=1;
dofindrep(count);
}
dofindrep(count)
int count;
{
int cp, i, len;
char c;
puttext();
do {
count--;
if (find() == FAIL) count=0;
else if (replace) {
if (nocheck) c='y';
else {
gotoxy(EMPOS,0);
putstr(" Replace |{|Y|/|N|}|? ");
do {
gotoxy(REPPOS,0);
for (i=0; i < 10*CURSORWAIT; i++);
resetcursor();
for (i=0; i < 10*CURSORWAIT; i++);
}
while ((c=testlow()) != 'y' && c != 'n'
&& c != ESCKEY);
}
deleteline(EMPOS,0);
switch(c) {
case 'y' :
if (strlen(text)+(len=strlen(patt)) >= LLIM) {
error("Line would be too long");
return;
}
for (cp=charn; (text[cp]=text[cp+len]); cp++);
for (cp=strlen(text), len=strlen(changeto);
cp >= charn; cp--)
text[cp+len]=text[cp];
for (i=0; (c=changeto[i]); i++) text[charn++]=c;
altered=YES;
puttext();
rewrite(++cp,cursorx);
sync(charn);
break;
case ESCKEY:
count=0;
error("Search stopped");
case 'n' :
movechar(findir);
break;
}
}
}
while(count);
inbufp=0;
}
/*find 'patt', searching back (findir== -1) or forwards (1) from
* current line. Return FAIL or YES, and set current line to
* that containing pattern
*/
find()
{
int fline, oldcharn, newcharn, interupt;
register int linecount, pos;
register char *s, pattch1, *p, *t;
char lcline[LLIM];
if (!replace || repeat) movechar(findir);
fline=cline;
oldcharn=charn;
interupt=NO;
linecount= cline%100;
pattch1=patt[0];
gotoxy(WAITPOS,0);
if (findir == 1)
while (fline <= lastl) {
if (linecount++ == 100) {
linecount=1;
ptlineno(fline);
gotoxy(WAITPOS,0);
if (testkey() == ESCKEY) {
interupt=YES;
goto interrupted;
}
}
s=getline(fline)+charn;
if (nocase) {
for (t=lcline; (*t=tolower(*s & NOPARITY));
s++, t++);
s=lcline;
}
if ( (pos=indexx(s,patt)) != FAIL) {
charn+=pos;
goto foundit;
}
fline++;
charn=0;
}
else
while (fline >= 1) {
if (linecount-- == 0) {
linecount=99;
ptlineno(fline);
gotoxy(WAITPOS,0);
if (testkey() == ESCKEY) {
interupt=YES;
goto interrupted;
}
}
s=getline(fline);
if (nocase) {
for (t=lcline; (*t=tolower(*s)); s++, t++);
s=lcline;
}
for (; charn >= 0; charn--)
if (*(p= &s[charn]) == pattch1) {
for (t=patt+1,p++; *t && *p == *t; p++, t++);
if (!*t) goto foundit;
}
charn=strlen(getline(--fline))-1;
}
interrupted:
charn=oldcharn;
if (!replace || repeat) movechar(-findir);
if (interupt) {
error("Search aborted");
ptlineno(cline);
}
else error(" Search fails");
return FAIL;
foundit:
newcharn=charn;
moveline(fline-cline);
sync(charn=newcharn);
return YES;
}
static
indexx(str,substr)
char *str, *substr;
/*
* Returns index of substr in str, or -1 if not found.
*/
{
register char *p, *q, *s;
register int c;
c = *substr;
p = str -1;
for(;;){
do {
if( *++p == 0) /* end of str? */
return (-1); /* not found. */
}
while (c != *p);
q = p; /* first char matched */
s = substr;
do {
q++;
if(*++s == 0) /* end of substr? */
return (int)(p - str);
}
while (*s == *q); /* current char match? */
}
}