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/*
* data.c -- basic data structures and functions to manipulate them
*
* Copyright (C) 1998 by Massimiliano Ghilardi
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <time.h>
#include <sys/time.h>
#include "defines.h"
#include "main.h"
#include "utils.h"
#include "eval.h"
/*
* create a new, empty ptr.
* return NULL if max == 0
*/
ptr ptrnew(int max)
{
ptr p = (ptr)0;
if (max == 0)
;
else if (limit_mem && max > limit_mem)
error = MEM_LIMIT_ERROR;
else if (max < 0 || max + sizeofptr < max) /* overflow! */
error = NO_MEM_ERROR;
else if ((p = (ptr)malloc(max + sizeofptr))) {
p->signature = PTR_SIG;
p->max = max;
ptrdata(p)[p->len = 0] = '\0';
} else
error = NO_MEM_ERROR;
return p;
}
/*
* create a new ptr giving an initial contents,
* which gets duplicated.
*
* warning: newmax could be so small that we must truncate the copied data!
*/
ptr ptrdup2(ptr src, int newmax)
{
ptr p = (ptr)0;
if (newmax == 0)
;
else if (newmax < 0 || newmax + sizeofptr < newmax)
error = NO_MEM_ERROR;
else if (limit_mem && newmax > limit_mem)
error = MEM_LIMIT_ERROR;
else if (!src)
p = ptrnew(newmax);
else if ((p = malloc(newmax + sizeofptr))) {
p->signature = PTR_SIG;
p->max = newmax;
if (newmax > ptrlen(src))
newmax = ptrlen(src);
memmove(ptrdata(p), ptrdata(src), p->len = newmax);
ptrdata(p)[newmax] = '\0';
} else
error = NO_MEM_ERROR;
return p;
}
ptr ptrdup(ptr src)
{
if (!src)
return src;
return ptrdup2(src, ptrlen(src));
}
/* delete (free) a ptr */
void _ptrdel(ptr p)
{
if (p && p->signature == PTR_SIG)
free((void *)p);
/* else */
/* fprintf( stderr, "Tried to free non ptr @%x\n", p ); */
}
/* clear a ptr */
void ptrzero(ptr p)
{
if (p) {
p->len = 0;
ptrdata(p)[0] = '\0';
}
}
/* truncate a ptr to len chars */
void ptrtrunc(ptr p, int len)
{
if (p) {
if (len < 0 || len > ptrlen(p))
return;
ptrdata(p)[p->len = len] = '\0';
}
}
/* shrink a ptr by len chars */
void ptrshrink(ptr p, int len)
{
if (p) {
if (len < 0 || len > ptrlen(p))
return;
ptrdata(p)[p->len -= len] = '\0';
}
}
/*
* concatenate two ptr (ptrcat) or a ptr and a char* (ptrmcat)
* result may be a _newly_allocated_ ptr if original one
* is too small or if it is soooo big that we are wasting tons of memory.
* In both cases, the original one may get deleted (freed)
* You have been warned! Don't use any statically created ptr for
* write operations, and you will be fine.
*/
ptr __ptrmcat(ptr dst, char *src, int len, int shrink)
{
int newmax, failmax, overlap;
char mustalloc;
if (!src || len <= 0)
return dst;
if (len + sizeofptr < 0) {
/* overflow! */
error = NO_MEM_ERROR;
return dst;
}
if (!dst) {
failmax = len;
mustalloc = 1;
} else {
failmax = ptrlen(dst) + len;
mustalloc = ptrmax(dst) < ptrlen(dst) + len;
if (shrink && ptrmax(dst) > PARAMLEN
&& ptrmax(dst)/4 > ptrlen(dst) + len)
/* we're wasting space, shrink dst */
mustalloc = 1;
}
if (failmax + sizeofptr < 0) {
/* overflow! */
error = NO_MEM_ERROR;
return dst;
}
if (mustalloc) {
/* dst must be (re)allocated */
ptr p;
/* ugly but working: check for overlapping dst and src */
if (dst && src >= ptrdata(dst) && src < ptrdata(dst) + ptrmax(dst))
overlap = 1;
else
overlap = 0;
/* find a suitable new size */
if (limit_mem && failmax > limit_mem) {
error = MEM_LIMIT_ERROR;
return dst;
}
if (failmax < PARAMLEN / 2)
newmax = PARAMLEN;
else if (failmax / 1024 < PARAMLEN && failmax + PARAMLEN + sizeofptr > 0)
newmax = failmax + PARAMLEN;
else
newmax = failmax;
if (limit_mem && newmax > limit_mem) {
if (len + (dst ? ptrlen(dst) : 0) > limit_mem)
len = limit_mem - (dst ? ptrlen(dst) : 0);
if (len < 0)
len = 0;
newmax = limit_mem;
}
if ((p = (ptr)realloc((void *)dst, newmax + sizeofptr))) {
if (dst == NULL)
p->signature = PTR_SIG;
if (overlap)
src = ptrdata(p) + (src - ptrdata(dst));
if (!dst)
p->len = 0;
p->max = newmax;
dst = p;
} else if ((p = ptrdup2(dst, newmax))) {
if (overlap)
src = ptrdata(p) + (src - ptrdata(dst));
ptrdel(dst);
dst = p;
} else {
error = NO_MEM_ERROR;
return dst;
}
}
if (ptrdata(dst) + ptrlen(dst) != src)
memmove(ptrdata(dst) + ptrlen(dst), src, len);
dst->len += len;
ptrdata(dst)[ptrlen(dst)] = '\0';
return dst;
}
ptr ptrmcat(ptr dst, char *src, int len)
{
return __ptrmcat(dst, src, len, 1);
}
ptr ptrcat(ptr dst, ptr src)
{
if (src)
return __ptrmcat(dst, ptrdata(src), ptrlen(src), 1);
return dst;
}
/*
* copy a ptr into another (ptrcpy), or a char* into a ptr (ptrmcpy);
* same warning as above if dst is too small or way too big.
*/
ptr __ptrmcpy(ptr dst, char *src, int len, int shrink)
{
int newmax, failmax = len, overlap;
char mustalloc;
if (!src || len<=0) {
if (len>=0)
ptrzero(dst);
return dst;
}
if (failmax + sizeofptr < 0) {
/* overflow! */
error = NO_MEM_ERROR;
return dst;
}
if (!dst) {
mustalloc = 1;
} else {
mustalloc = ptrmax(dst) < len;
if (shrink && ptrmax(dst) > PARAMLEN && ptrmax(dst)/4 > len)
/* we're wasting space, shrink dst */
mustalloc = 1;
}
if (mustalloc) {
/* dst must be (re)allocated */
ptr p;
/* ugly but working: check for overlapping dst and src */
if (dst && src >= ptrdata(dst) && src < ptrdata(dst) + ptrmax(dst))
overlap = 1;
else
overlap = 0;
/* find a suitable new size */
if (limit_mem && failmax > limit_mem) {
error = MEM_LIMIT_ERROR;
return dst;
}
if (failmax < PARAMLEN / 2)
newmax = PARAMLEN;
else if (failmax / 1024 < PARAMLEN && failmax + PARAMLEN + sizeofptr > 0)
newmax = failmax + PARAMLEN;
else
newmax = failmax;
if (limit_mem && newmax > limit_mem) {
if (len > limit_mem)
len = limit_mem;
newmax = limit_mem;
}
if ((p = (ptr)realloc((void *)dst, newmax + sizeofptr))) {
if (dst == NULL)
p->signature = PTR_SIG;
if (overlap)
src = ptrdata(p) + (src - ptrdata(dst));
if (!dst)
p->len = 0;
p->max = newmax;
dst = p;
} else if ((p = ptrdup2(dst, newmax))) {
if (overlap)
src = ptrdata(p) + (src - ptrdata(dst));
ptrdel(dst);
dst = p;
} else {
error = NO_MEM_ERROR;
return dst;
}
}
if (ptrdata(dst) != src)
memmove(ptrdata(dst), src, len);
dst->len = len;
ptrdata(dst)[ptrlen(dst)] = '\0';
return dst;
}
ptr ptrmcpy(ptr dst, char *src, int len)
{
return __ptrmcpy(dst, src, len, 1);
}
ptr ptrcpy(ptr dst, ptr src)
{
if (src)
return __ptrmcpy(dst, ptrdata(src), ptrlen(src), 1);
ptrzero(dst);
return dst;
}
/* enlarge a ptr by len chars. create new if needed */
ptr ptrpad(ptr p, int len)
{
if (!p) {
if (len<=0)
return p;
else
return ptrnew(len);
}
if (len > ptrmax(p) - ptrlen(p)) {
/* must realloc the ptr */
len += ptrlen(p);
if (len < 0) {
/* overflow! */
error = NO_MEM_ERROR;
return p;
}
/*
* cheat: we use ptrmcpy with src==dst
* and do an out-of-boud read of src.
* works since dst (==src) gets enlarged
* before doing the copy.
*/
p = ptrmcpy(p, ptrdata(p), len);
} else {
p->len += len;
ptrdata(p)[ptrlen(p)] = '\0';
}
return p;
}
/* set a ptr to be len chars at minimum. create new if needed */
ptr ptrsetlen(ptr p, int len)
{
if (!p) {
if (len<=0)
return p;
else {
if ((p = ptrnew(len)))
ptrdata(p)[p->len = len] = '\0';
return p;
}
}
return ptrpad(p, len - ptrlen(p));
}
/*
* compare two ptr (ptrcmp) or a ptr and a char* (ptrmcmp)
* if one is a truncated copy of the other, the shorter is considered smaller
*/
int ptrmcmp(ptr p, char *q, int lenq)
{
int res;
if (!p || !ptrlen(p)) {
if (!q || lenq<=0)
/* both empty */
res = 0;
else
res = -1;
} else if (!q || lenq<=0)
res = 1;
else if ((res = memcmp(ptrdata(p), q, MIN2(ptrlen(p), lenq))))
;
else if (ptrlen(p) < lenq)
res = -1;
else if (ptrlen(p) > lenq)
res = 1;
else
res = 0;
return res;
}
int ptrcmp(ptr p, ptr q)
{
if (q)
return ptrmcmp(p, ptrdata(q), ptrlen(q));
else if (p)
return 1;
else
return 0;
}
/*
* find first occurrence of c in p
* return NULL if none found.
*/
char *ptrchr(ptr p, char c)
{
if (p)
return (char *)memchr(ptrdata(p), c, ptrlen(p));
return (char*)p; /* shortcut for NULL */
}
/*
* find last occurrence of c in p
* return NULL if none found.
*/
char *memrchr(char *p, int lenp, char c)
{
char *v, *s = p;
if (!p || lenp<=0)
return NULL;
v = s + lenp - 1;
while (v != s && *v != c) {
v--;
}
if (v != s)
return v;
else
return NULL;
}
char *ptrrchr(ptr p, char c)
{
if (p)
return memrchr(ptrdata(p), ptrlen(p), c);
return (char*)p; /* shortcut for NULL */
}
#ifndef _GNU_SOURCE
/*
* find first occurrence of needle in hay
*
* GNU libc has memmem(), for others we do by hand.
*/
char *memfind(char *hay, int haylen, char *needle, int needlelen)
{
char *tmp;
if (!hay || haylen<=0 || needlelen<0)
return NULL;
if (!needle || !needlelen)
return hay;
while (haylen >= needlelen) {
/* find a matching first char */
if ((tmp = memchr(hay, *needle, haylen))) {
if ((haylen -= (tmp-hay)) < needlelen)
return NULL;
hay = tmp;
} else
return NULL;
/* got a matching first char,
* check the rest */
if (!memcmp(needle, tmp, needlelen))
return tmp;
hay++, haylen --;
}
return NULL;
}
#endif /* !_GNU_SOURCE */
/*
* find first occurrence of q in p,
* return NULL if none found.
*/
char *ptrmfind(ptr p, char *q, int lenq)
{
if (p) {
if (q && lenq>0)
return (char *)memfind(ptrdata(p), ptrlen(p), q, lenq);
return ptrdata(p);
}
return (char*)p; /* shortcut for NULL */
}
char *ptrfind(ptr p, ptr q)
{
if (p) {
if (q)
return (char *)memfind(ptrdata(p), ptrlen(p), ptrdata(q), ptrlen(q));
return ptrdata(p);
}
return (char*)p; /* shortcut for NULL */
}
/*
* Scan p for the first occurrence of one of the characters in q,
* return NULL if none of them is found.
*/
char *memchrs(char *p, int lenp, char *q, int lenq)
{
char *endp;
if (!q || lenq<=0)
return p;
if (!p || lenp<=0)
return NULL;
endp = p + lenp;
while (p < endp && !memchr(q, *p, lenq))
p++;
if (p == endp)
return NULL;
return p;
}
char *ptrmchrs(ptr p, char *q, int lenq)
{
if (p)
return memchrs(ptrdata(p), ptrlen(p), q, lenq);
return (char*)p; /* shortcut for NULL */
}
char *ptrchrs(ptr p, ptr q)
{
if (p) {
if (q)
return memchrs(ptrdata(p), ptrlen(p), ptrdata(q), ptrlen(q));
return ptrdata(p);
}
return (char*)p; /* shortcut for NULL */
}
/*
* Scan p for the last occurrence of one of the characters in q,
* return NULL if none of them is found.
*/
char *memrchrs(char *p, int lenp, char *q, int lenq)
{
if (!p || lenp<=0) {
if (!q || lenq<=0)
return p;
else
return NULL;
}
p += lenp;
if (!q || lenq<=0)
return p;
do {
lenp--, p--;
} while (lenp >= 0 && !memchr(q, *p, lenq));
if (lenp < 0)
return NULL;
return p;
}
char *ptrmrchrs(ptr p, char *q, int lenq)
{
if (p)
return memrchrs(ptrdata(p), ptrlen(p), q, lenq);
return (char*)p; /* shortcut for NULL */
}
char *ptrrchrs(ptr p, ptr q)
{
if (p && q)
return memrchrs(ptrdata(p), ptrlen(p), ptrdata(q), ptrlen(q));
return p ? ptrdata(p) + ptrlen(p) : (char*)p; /* shortcut for NULL */
}
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