/* NetHack 3.7 hacklib.c $NHDT-Date: 1706213796 2024/01/25 20:16:36 $ $NHDT-Branch: NetHack-3.7 $:$NHDT-Revision: 1.116 $ */

/* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */

/*-Copyright (c) Michael Allison, 2007. */

/* Copyright (c) Robert Patrick Rankin, 1991 */

/* NetHack may be freely redistributed. See license for details. */

#include "hack.h" /* for config.h+extern.h */

/*=

Assorted 'small' utility routines. They're virtually independent of

NetHack.

return type routine name argument type(s)

boolean digit (char)

boolean letter (char)

char highc (char)

char lowc (char)

char * lcase (char *)

char * ucase (char *)

char * upstart (char *)

char * upwords (char *)

char * mungspaces (char *)

char * trimspaces (char *)

char * strip_newline (char *)

char * stripchars (char *, const char *, const char *)

char * stripdigits (char *)

char * eos (char *)

const char * c_eos (const char *)

boolean str_start_is (const char *, const char *, boolean)

boolean str_end_is (const char *, const char *)

int str_lines_maxlen (const char *)

char * strkitten (char *,char)

void copynchars (char *,const char *,int)

char chrcasecpy (int,int)

char * strcasecpy (char *,const char *)

char * s_suffix (const char *)

char * ing_suffix (const char *)

char * xcrypt (const char *, char *)

boolean onlyspace (const char *)

char * tabexpand (char *)

char * visctrl (char)

char * strsubst (char *, const char *, const char *)

int strNsubst (char *,const char *,const char *,int)

const char * findword (const char *,const char *,int,boolean)

const char * ordin (int)

char * sitoa (int)

int sgn (int)

int distmin (coordxy, coordxy, coordxy, coordxy)

int dist2 (coordxy, coordxy, coordxy, coordxy)

boolean online2 (coordxy, coordxy)

int strncmpi (const char *, const char *, int)

char * strstri (const char *, const char *)

boolean fuzzymatch (const char *, const char *,

const char *, boolean)

int swapbits (int, int, int)

void nh_snprintf (const char *, int, char *, size_t,

const char *, ...)

=*/

/* is 'c' a digit? */

boolean

digit(char c)

{

return (boolean) ('0' <= c && c <= '9');

}

/* is 'c' a letter? note: '@' classed as letter */

boolean

letter(char c)

{

return (boolean) ('@' <= c && c <= 'Z') || ('a' <= c && c <= 'z');

}

/* force 'c' into uppercase */

char

highc(char c)

{

return (char) (('a' <= c && c <= 'z') ? (c & ~040) : c);

}

/* force 'c' into lowercase */

char

lowc(char c)

{

return (char) (('A' <= c && c <= 'Z') ? (c | 040) : c);

}

/* convert a string into all lowercase */

char *

lcase(char *s)

{

char *p;

for (p = s; *p; p++)

if ('A' <= *p && *p <= 'Z')

*p |= 040;

return s;

}

/* convert a string into all uppercase */

char *

ucase(char *s)

{

char *p;

for (p = s; *p; p++)

if ('a' <= *p && *p <= 'z')

*p &= ~040;

return s;

}

/* convert first character of a string to uppercase */

char *

upstart(char *s)

{

if (s)

*s = highc(*s);

return s;

}

/* capitalize first letter of every word in a string (in place) */

char *

upwords(char *s)

{

char *p;

boolean space = TRUE;

for (p = s; *p; p++)

if (*p == ' ') {

space = TRUE;

} else if (space && letter(*p)) {

*p = highc(*p);

space = FALSE;

} else {

space = FALSE;

}

return s;

}

/* remove excess whitespace from a string buffer (in place) */

char *

mungspaces(char *bp)

{

char c, *p, *p2;

boolean was_space = TRUE;

for (p = p2 = bp; (c = *p) != '\0'; p++) {

if (c == '\n')

break; /* treat newline the same as end-of-string */

if (c == '\t')

c = ' ';

if (c != ' ' || !was_space)

*p2++ = c;

was_space = (c == ' ');

}

if (was_space && p2 > bp)

p2--;

*p2 = '\0';

return bp;

}

/* skip leading whitespace; remove trailing whitespace, in place */

char *

trimspaces(char *txt)

{

char *end;

/* leading whitespace will remain in the buffer */

while (*txt == ' ' || *txt == '\t')

txt++;

end = eos(txt);

while (--end >= txt && (*end == ' ' || *end == '\t'))

*end = '\0';

return txt;

}

/* remove \n from end of line; remove \r too if one is there */

char *

strip_newline(char *str)

{

char *p = strrchr(str, '\n');

if (p) {

if (p > str && *(p - 1) == '\r')

--p;

*p = '\0';

}

return str;

}

/* return the end of a string (pointing at '\0') */

char *

eos(char *s)

{

while (*s)

s++; /* s += strlen(s); */

return s;

}

/* version of eos() which takes a const* arg and returns that result */

const char *

c_eos(const char *s)

{

while (*s)

s++; /* s += strlen(s); */

return s;

}

/* determine whether 'str' starts with 'chkstr', possibly ignoring case;

* panics on huge strings */

boolean

str_start_is(

const char *str,

const char *chkstr,

boolean caseblind)

{

char t1, t2;

int n = LARGEST_INT;

while (--n) {

if (!*str)

return (*chkstr == 0); /* chkstr >= str */

else if (!*chkstr)

return TRUE; /* chkstr < str */

t1 = caseblind ? lowc(*str) : *str;

t2 = caseblind ? lowc(*chkstr) : *chkstr;

str++, chkstr++;

if (t1 != t2)

return FALSE;

}

#if 0

if (n == 0)

panic("string too long");

#endif

return TRUE;

}

/* determine whether 'str' ends in 'chkstr' */

boolean

str_end_is(const char *str, const char *chkstr)

{

int clen = (int) strlen(chkstr);

if ((int) strlen(str) >= clen)

return (boolean) (!strncmp(eos((char *) str) - clen, chkstr, clen));

return FALSE;

}

/* return max line length from buffer comprising newline-separated strings */

int

str_lines_maxlen(const char *str)

{

const char *s1, *s2;

int len, max_len = 0;

s1 = str;

while (s1 && *s1) {

s2 = strchr(s1, '\n');

if (s2) {

len = (int) (s2 - s1);

s1 = s2 + 1;

} else {

len = (int) strlen(s1);

s1 = (char *) 0;

}

if (len > max_len)

max_len = len;

}

return max_len;

}

/* append a character to a string (in place): strcat(s, {c,'\0'}); */

char *

strkitten(char *s, char c)

{

char *p = eos(s);

*p++ = c;

*p = '\0';

return s;

}

/* truncating string copy */

void

copynchars(char *dst, const char *src, int n)

{

/* copies at most n characters, stopping sooner if terminator reached;

treats newline as input terminator; unlike strncpy, always supplies

'\0' terminator so dst must be able to hold at least n+1 characters */

while (n > 0 && *src != '\0' && *src != '\n') {

*dst++ = *src++;

--n;

}

*dst = '\0';

}

/* convert char nc into oc's case; mostly used by strcasecpy */

char

chrcasecpy(int oc, int nc)

{

#if 0 /* this will be necessary if we switch to <ctype.h> */

oc = (int) (unsigned char) oc;

nc = (int) (unsigned char) nc;

#endif

if ('a' <= oc && oc <= 'z') {

/* old char is lower case; if new char is upper case, downcase it */

if ('A' <= nc && nc <= 'Z')

nc += 'a' - 'A'; /* lowc(nc) */

} else if ('A' <= oc && oc <= 'Z') {

/* old char is upper case; if new char is lower case, upcase it */

if ('a' <= nc && nc <= 'z')

nc += 'A' - 'a'; /* highc(nc) */

}

return (char) nc;

}

/* overwrite string, preserving old chars' case;

for case-insensitive editions of makeplural() and makesingular();

src might be shorter, same length, or longer than dst */

char *

strcasecpy(char *dst, const char *src)

{

char *result = dst;

int ic, oc, dst_exhausted = 0;

/* while dst has characters, replace each one with corresponding

character from src, converting case in the process if they differ;

once dst runs out, propagate the case of its last character to any

remaining src; if dst starts empty, it must be a pointer to the

tail of some other string because we examine the char at dst[-1] */

while ((ic = (int) *src++) != '\0') {

if (!dst_exhausted && !*dst)

dst_exhausted = 1;

oc = (int) *(dst - dst_exhausted);

*dst++ = chrcasecpy(oc, ic);

}

*dst = '\0';

return result;

}

/* return a name converted to possessive */

char *

s_suffix(const char *s)

{

static char buf[BUFSZ];

Strcpy(buf, s);

if (!strcmpi(buf, "it")) /* it -> its */

Strcat(buf, "s");

else if (!strcmpi(buf, "you")) /* you -> your */

Strcat(buf, "r");

else if (*(eos(buf) - 1) == 's') /* Xs -> Xs' */

Strcat(buf, "'");

else /* X -> X's */

Strcat(buf, "'s");

return buf;

}

/* construct a gerund (a verb formed by appending "ing" to a noun) */

char *

ing_suffix(const char *s)

{

static const char vowel[] = "aeiouwy";

static char buf[BUFSZ];

char onoff[10];

char *p;

Strcpy(buf, s);

p = eos(buf);

onoff[0] = *p = *(p + 1) = '\0';

if ((p >= &buf[3] && !strcmpi(p - 3, " on"))

|| (p >= &buf[4] && !strcmpi(p - 4, " off"))

|| (p >= &buf[5] && !strcmpi(p - 5, " with"))) {

p = strrchr(buf, ' ');

Strcpy(onoff, p);

*p = '\0';

}

if (p >= &buf[2] && !strcmpi(p - 2, "er")) { /* slither + ing */

/* nothing here */

} else if (p >= &buf[3] && !strchr(vowel, *(p - 1))

&& strchr(vowel, *(p - 2)) && !strchr(vowel, *(p - 3))) {

/* tip -> tipp + ing */

*p = *(p - 1);

*(p + 1) = '\0';

} else if (p >= &buf[2] && !strcmpi(p - 2, "ie")) { /* vie -> vy + ing */

*(p - 2) = 'y';

*(p - 1) = '\0';

} else if (p >= &buf[1] && *(p - 1) == 'e') /* grease -> greas + ing */

*(p - 1) = '\0';

Strcat(buf, "ing");

if (onoff[0])

Strcat(buf, onoff);

return buf;

}

/* trivial text encryption routine (see makedefs) */

char *

xcrypt(const char *str, char *buf)

{

const char *p;

char *q;

int bitmask;

for (bitmask = 1, p = str, q = buf; *p; q++) {

*q = *p++;

if (*q & (32 | 64))

*q ^= bitmask;

if ((bitmask <<= 1) >= 32)

bitmask = 1;

}

*q = '\0';

return buf;

}

/* is a string entirely whitespace? */

boolean

onlyspace(const char *s)

{

for (; *s; s++)

if (*s != ' ' && *s != '\t')

return FALSE;

return TRUE;

}

/* expand tabs into proper number of spaces (in place) */

char *

tabexpand(

char *sbuf) /* assumed to be [BUFSZ] but can be smaller provided that

* expanded string fits; expansion bigger than BUFSZ-1

* will be truncated */

{

char buf[BUFSZ + 10];

char *bp, *s = sbuf;

int idx;

if (!*s)

return sbuf;

for (bp = buf, idx = 0; *s; s++) {

if (*s == '\t') {

/*

* clang-8's optimizer at -Os has been observed to mis-compile

* this code. Symptom is nethack getting stuck in an apparent

* infinite loop (or perhaps just an extremely long one) when

* examining data.base entries.

* clang-9 doesn't exhibit this problem. [Was the incorrect

* optimization fixed or just disabled?]

*/

do

*bp++ = ' ';

while (++idx % 8);

} else {

*bp++ = *s;

++idx;

}

if (idx >= BUFSZ) {

bp = &buf[BUFSZ - 1];

break;

}

}

*bp = 0;

return strcpy(sbuf, buf);

}

#define VISCTRL_NBUF 5

/* make a displayable string from a character */

char *

visctrl(char c)

{

static char visctrl_bufs[VISCTRL_NBUF][5];

static int nbuf = 0;

int i = 0;

char *ccc = visctrl_bufs[nbuf];

nbuf = (nbuf + 1) % VISCTRL_NBUF;

if ((uchar) c & 0200) {

ccc[i++] = 'M';

ccc[i++] = '-';

}

c &= 0177;

if (c < 040) {

ccc[i++] = '^';

ccc[i++] = c | 0100; /* letter */

} else if (c == 0177) {

ccc[i++] = '^';

ccc[i++] = c & ~0100; /* '?' */

} else {

ccc[i++] = c; /* printable character */

}

ccc[i] = '\0';

return ccc;

}

/* strip all the chars in stuff_to_strip from orig */

/* caller is responsible for ensuring that bp is a

valid pointer to a BUFSZ buffer */

char *

stripchars(

char *bp,

const char *stuff_to_strip,

const char *orig)

{

int i = 0;

char *s = bp;

while (*orig && i < (BUFSZ - 1)) {

if (!strchr(stuff_to_strip, *orig)) {

*s++ = *orig;

i++;

}

orig++;

}

*s = '\0';

return bp;

}

/* remove digits from string */

char *

stripdigits(char *s)

{

char *s1, *s2;

for (s1 = s2 = s; *s1; s1++)

if (*s1 < '0' || *s1 > '9')

*s2++ = *s1;

*s2 = '\0';

return s;

}

/* substitute a word or phrase in a string (in place);

caller is responsible for ensuring that bp points to big enough buffer */

char *

strsubst(

char *bp,

const char *orig,

const char *replacement)

{

char *found, buf[BUFSZ];

/* [this could be replaced by strNsubst(bp, orig, replacement, 1)] */

found = strstr(bp, orig);

if (found) {

Strcpy(buf, found + strlen(orig));

Strcpy(found, replacement);

Strcat(bp, buf);

}

return bp;

}

/* substitute the Nth occurrence of a substring within a string (in place);

if N is 0, substitute all occurrences; returns the number of substitutions;

maximum output length is BUFSZ (BUFSZ-1 chars + terminating '\0') */

int

strNsubst(

char *inoutbuf, /* current string, and result buffer */

const char *orig, /* old substring; if "", insert in front of Nth char */

const char *replacement, /* new substring; if "", delete old substring */

int n) /* which occurrence to replace; 0 => all */

{

char *bp, *op, workbuf[BUFSZ];

const char *rp;

unsigned len = (unsigned) strlen(orig);

int ocount = 0, /* number of times 'orig' has been matched */

rcount = 0; /* number of substitutions made */

for (bp = inoutbuf, op = workbuf; *bp && op < &workbuf[BUFSZ - 1]; ) {

if ((!len || !strncmp(bp, orig, len)) && (++ocount == n || n == 0)) {

/* Nth match found */

for (rp = replacement; *rp && op < &workbuf[BUFSZ - 1]; )

*op++ = *rp++;

++rcount;

if (len) {

bp += len; /* skip 'orig' */

continue;

}

}

/* no match (or len==0) so retain current character */

*op++ = *bp++;

}

if (!len && n == ocount + 1) {

/* special case: orig=="" (!len) and n==strlen(inoutbuf)+1,

insert in front of terminator (in other words, append);

[when orig=="", ocount will have been incremented once for

each input char] */

for (rp = replacement; *rp && op < &workbuf[BUFSZ - 1]; )

*op++ = *rp++;

++rcount;

}

if (rcount) {

*op = '\0';

Strcpy(inoutbuf, workbuf);

}

return rcount;

}

/* search for a word in a space-separated list; returns non-Null if found */

const char *

findword(

const char *list, /* string of space-separated words */

const char *word, /* word to try to find */

int wordlen, /* so that it isn't required to be \0 terminated */

boolean ignorecase) /* T: case-blind, F: case-sensitive */

{

const char *p = list;

while (p) {

while (*p == ' ')

++p;

if (!*p)

break;

if ((ignorecase ? !strncmpi(p, word, wordlen)

: !strncmp(p, word, wordlen))

&& (p[wordlen] == '\0' || p[wordlen] == ' '))

return p;

p = strchr(p + 1, ' ');

}

return (const char *) 0;

}

/* return the ordinal suffix of a number */

const char *

ordin(int n) /* note: should be non-negative */

{

int dd = n % 10;

return (dd == 0 || dd > 3 || (n % 100) / 10 == 1) ? "th"

: (dd == 1) ? "st" : (dd == 2) ? "nd" : "rd";

}

DISABLE_WARNING_FORMAT_NONLITERAL /* one compiler complains about

result of ?: for format string */

/* make a signed digit string from a number */

char *

sitoa(int n)

{

static char buf[13];

Sprintf(buf, (n < 0) ? "%d" : "+%d", n);

return buf;

}

RESTORE_WARNING_FORMAT_NONLITERAL

/* return the sign of a number: -1, 0, or 1 */

int

sgn(int n)

{

return (n < 0) ? -1 : (n != 0);

}

/* distance between two points, in moves */

int

distmin(coordxy x0, coordxy y0, coordxy x1, coordxy y1)

{

coordxy dx = x0 - x1, dy = y0 - y1;

if (dx < 0)

dx = -dx;

if (dy < 0)

dy = -dy;

/* The minimum number of moves to get from (x0,y0) to (x1,y1) is the

* larger of the [absolute value of the] two deltas.

*/

return (dx < dy) ? dy : dx;

}

/* square of Euclidean distance between pair of pts */

int

dist2(coordxy x0, coordxy y0, coordxy x1, coordxy y1)

{

coordxy dx = x0 - x1, dy = y0 - y1;

return dx * dx + dy * dy;

}

/* integer square root function without using floating point */

int

isqrt(int val)

{

int rt = 0;

int odd = 1;

/*

* This could be replaced by a faster algorithm, but has not been because:

* + the simple algorithm is easy to read;

* + this algorithm does not require 64-bit support;

* + in current usage, the values passed to isqrt() are not really that

* large, so the performance difference is negligible;

* + isqrt() is used in only few places, which are not bottle-necks.

*/

while (val >= odd) {

val = val - odd;

odd = odd + 2;

rt = rt + 1;

}

return rt;

}

/* are two points lined up (on a straight line)? */

boolean

online2(coordxy x0, coordxy y0, coordxy x1, coordxy y1)

{

int dx = x0 - x1, dy = y0 - y1;

/* If either delta is zero then they're on an orthogonal line,

* else if the deltas are equal (signs ignored) they're on a diagonal.

*/

return (boolean) (!dy || !dx || dy == dx || dy == -dx);

}

#ifndef STRNCMPI

/* case insensitive counted string comparison */

/*{ aka strncasecmp }*/

int

strncmpi(

const char *s1, const char *s2,

int n) /*(should probably be size_t, which is unsigned)*/

{

char t1, t2;

while (n--) {

if (!*s2)

return (*s1 != 0); /* s1 >= s2 */

else if (!*s1)

return -1; /* s1 < s2 */

t1 = lowc(*s1++);

t2 = lowc(*s2++);

if (t1 != t2)

return (t1 > t2) ? 1 : -1;

}

return 0; /* s1 == s2 */

}

#endif /* STRNCMPI */

#ifndef STRSTRI

/* case insensitive substring search */

char *

strstri(const char *str, const char *sub)

{

const char *s1, *s2;

int i, k;

#define TABSIZ 0x20 /* 0x40 would be case-sensitive */

char tstr[TABSIZ], tsub[TABSIZ]; /* nibble count tables */

#if 0

assert( (TABSIZ & ~(TABSIZ-1)) == TABSIZ ); /* must be exact power of 2 */

assert( &lowc != 0 ); /* can't be unsafe macro */

#endif

/* special case: empty substring */

if (!*sub)

return (char *) str;

/* do some useful work while determining relative lengths */

for (i = 0; i < TABSIZ; i++)

tstr[i] = tsub[i] = 0; /* init */

for (k = 0, s1 = str; *s1; k++)

tstr[*s1++ & (TABSIZ - 1)]++;

for (s2 = sub; *s2; --k)

tsub[*s2++ & (TABSIZ - 1)]++;

/* evaluate the info we've collected */

if (k < 0)

return (char *) 0; /* sub longer than str, so can't match */

for (i = 0; i < TABSIZ; i++) /* does sub have more 'x's than str? */

if (tsub[i] > tstr[i])

return (char *) 0; /* match not possible */

/* now actually compare the substring repeatedly to parts of the string */

for (i = 0; i <= k; i++) {

s1 = &str[i];

s2 = sub;

while (lowc(*s1++) == lowc(*s2++))

if (!*s2)

return (char *) &str[i]; /* full match */

}

return (char *) 0; /* not found */

}

#endif /* STRSTRI */

/* compare two strings for equality, ignoring the presence of specified

characters (typically whitespace) and possibly ignoring case */

boolean

fuzzymatch(

const char *s1, const char *s2,

const char *ignore_chars,

boolean caseblind)

{

char c1, c2;

do {

while ((c1 = *s1++) != '\0' && strchr(ignore_chars, c1) != 0)

continue;

while ((c2 = *s2++) != '\0' && strchr(ignore_chars, c2) != 0)

continue;

if (!c1 || !c2)

break; /* stop when end of either string is reached */

if (caseblind) {

c1 = lowc(c1);

c2 = lowc(c2);

}

} while (c1 == c2);

/* match occurs only when the end of both strings has been reached */

return (boolean) (!c1 && !c2);

}

/*

* Time routines

*

* The time is used for:

* - seed for rand()

* - year on tombstone and yyyymmdd in record file

* - phase of the moon (various monsters react to NEW_MOON or FULL_MOON)

* - night and midnight (the undead are dangerous at midnight)

* - determination of what files are "very old"

*/

/* TIME_type: type of the argument to time(); we actually use &(time_t);

you might need to define either or both of these to 'long *' in *conf.h */

#ifndef TIME_type

#define TIME_type time_t *

#endif

#ifndef LOCALTIME_type

#define LOCALTIME_type time_t *

#endif

/* swapbits(val, bita, bitb) swaps bit a with bit b in val */

int

swapbits(int val, int bita, int bitb)

{

int tmp = ((val >> bita) & 1) ^ ((val >> bitb) & 1);

return (val ^ ((tmp << bita) | (tmp << bitb)));

}

DISABLE_WARNING_FORMAT_NONLITERAL

/*

* Wrap snprintf for use in the main code.

*

* Wrap reasons:

* 1. If there are any platform issues, we have one spot to fix them -

* snprintf is a routine with a troubling history of bad implementations.

* 2. Add cumbersome error checking in one spot. Problems with text

* wrangling do not have to be fatal.

* 3. Gcc 9+ will issue a warning unless the return value is used.

* Annoyingly, explicitly casting to void does not remove the error.

* So, use the result - see reason #2.

*/

void

nh_snprintf(

const char *func UNUSED, int line UNUSED,

char *str, size_t size,

const char *fmt, ...)

{

va_list ap;

int n;

va_start(ap, fmt);

n = vsnprintf(str, size, fmt, ap);

va_end(ap);

if (n < 0 || (size_t) n >= size) { /* is there a problem? */

#if 0

TODO: add set_impossible(), impossible -> func pointer,

test funcpointer before call

impossible("snprintf %s: func %s, file line %d",

(n < 0) ? "format error" : "overflow",

func, line);

#endif

str[size - 1] = '\0'; /* make sure it is nul terminated */

}

}

RESTORE_WARNING_FORMAT_NONLITERAL

/* Unicode routines */

int

unicodeval_to_utf8str(int uval, uint8 *buffer, size_t bufsz)

{

// static uint8 buffer[7];

uint8 *b = buffer;

if (bufsz < 5)

return 0;

/*

* Binary Hex Comments

* 0xxxxxxx 0x00..0x7F Only byte of a 1-byte character encoding

* 10xxxxxx 0x80..0xBF Continuation byte : one of 1-3 bytes following

* first 110xxxxx 0xC0..0xDF First byte of a 2-byte character encoding

* 1110xxxx 0xE0..0xEF First byte of a 3-byte character encoding

* 11110xxx 0xF0..0xF7 First byte of a 4-byte character encoding

*/

*b = '\0';

if (uval < 0x80) {

*b++ = uval;

} else if (uval < 0x800) {

*b++ = 192 + uval / 64;

*b++ = 128 + uval % 64;

} else if (uval - 0xd800u < 0x800) {

return 0;

} else if (uval < 0x10000) {

*b++ = 224 + uval / 4096;

*b++ = 128 + uval / 64 % 64;

*b++ = 128 + uval % 64;

} else if (uval < 0x110000) {

*b++ = 240 + uval / 262144;

*b++ = 128 + uval / 4096 % 64;

*b++ = 128 + uval / 64 % 64;

*b++ = 128 + uval % 64;

} else {

return 0;

}

*b = '\0'; /* NUL terminate */

return 1;

}

int

case_insensitive_comp(const char *s1, const char *s2)

{

uchar u1, u2;

for (;; s1++, s2++) {

u1 = (uchar) *s1;

if (isupper(u1))

u1 = (uchar) tolower(u1);

u2 = (uchar) *s2;

if (isupper(u2))

u2 = (uchar) tolower(u2);

if (u1 == '\0' || u1 != u2)

break;

}

return u1 - u2;

}

boolean

copy_bytes(int ifd, int ofd)

{

char buf[BUFSIZ];

int nfrom, nto;

do {

nto = 0;

nfrom = read(ifd, buf, BUFSIZ);

/* read can return -1 */

if (nfrom >= 0 && nfrom <= BUFSIZ)

nto = write(ofd, buf, nfrom);

if (nto != nfrom || nfrom < 0)

return FALSE;

} while (nfrom == BUFSIZ);

return TRUE;

}

/*hacklib.c*/