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0 should be excluded from the range of acceptable values for asciitostr().

/* $OpenXM: OpenXM_contrib2/asir2000/builtin/strobj.c,v 1.4 2000/02/07 06:04:56 noro Exp $ */
#include "ca.h"
#include "parse.h"
#include "ctype.h"
#if PARI
#include "genpari.h"
extern jmp_buf environnement;
#endif
extern char *parse_strp;

void Prtostr(), Pstrtov(), Peval_str();
void Pstrtoascii(), Pasciitostr();

struct ftab str_tab[] = {
	{"rtostr",Prtostr,1},
	{"strtov",Pstrtov,1},
	{"eval_str",Peval_str,1},
	{"strtoascii",Pstrtoascii,1},
	{"asciitostr",Pasciitostr,1},
	{0,0,0},
};

void Pstrtoascii(arg,rp)
NODE arg;
LIST *rp;
{
	STRING str;
	unsigned char *p;
	int len,i;
	NODE n,n1;
	Q q;

	str = (STRING)ARG0(arg);
	asir_assert(str,O_STR,"strtoascii");
	p = BDY(str);
	len = strlen(p);
	for ( i = len-1, n = 0; i >= 0; i-- ) {
		UTOQ((unsigned int)p[i],q);
		MKNODE(n1,q,n);
		n = n1;
	}
	MKLIST(*rp,n);
}

void Pasciitostr(arg,rp)
NODE arg;
STRING *rp;
{
	LIST list;
	unsigned char *p;
	int len,i,j;
	NODE n;
	Q q;

	list = (LIST)ARG0(arg);
	asir_assert(list,O_LIST,"asciitostr");
	n = BDY(list);
	len = length(n);
	p = MALLOC_ATOMIC(len+1);
	for ( i = 0; i < len; i++, n = NEXT(n) ) {
		q = (Q)BDY(n);
		asir_assert(q,O_N,"asciitostr");
		j = QTOS(q);
		if ( j >= 256 || j <= 0 )
			error("asciitostr : argument out of range");
		p[i] = j;
	}
	p[i] = 0;
	MKSTR(*rp,(char *)p);
}

void Peval_str(arg,rp)
NODE arg;
Obj *rp;
{
	FNODE fnode;
	char *cmd;
#if PARI
	recover(0);
	if ( setjmp(environnement) ) {
		avma = top; recover(1);
		resetenv("");
	}
#endif
	cmd = BDY((STRING)ARG0(arg));
	exprparse(0,cmd,&fnode);
	*rp = eval(fnode);
}

void Prtostr(arg,rp)
NODE arg;
STRING *rp;
{
	char *b;
	int len;

	len = estimate_length(CO,ARG0(arg));
	b = (char *)MALLOC(len+1);
	soutput_init(b);
	sprintexpr(CO,ARG0(arg));
	MKSTR(*rp,b);
}

void Pstrtov(arg,rp)
NODE arg;
P *rp;
{
	char *p,*t;

	p = BDY((STRING)ARG0(arg));
#if 0
	if ( !islower(*p) )
		*rp = 0;
	else {
		for ( t = p+1; t && (isalnum(*t) || *t == '_'); t++ );
		if ( *t )
			*rp = 0;
		else
			makevar(p,rp);
	}
#else
	makevar(p,rp);
#endif
}