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/* $Header: util.c,v 1.0 87/12/18 13:07:34 root Exp $
*
* $Log: util.c,v $
* Revision 1.0 87/12/18 13:07:34 root
* Initial revision
*
*/
#include <stdio.h>
#include "handy.h"
#include "EXTERN.h"
#include "a2p.h"
#include "INTERN.h"
#include "util.h"
#define FLUSH
#define MEM_SIZE unsigned int
static char nomem[] = "Out of memory!\n";
/* paranoid version of malloc */
static int an = 0;
char *
safemalloc(size)
MEM_SIZE size;
{
char *ptr;
char *malloc();
ptr = malloc(size?size:1); /* malloc(0) is NASTY on our system */
#ifdef DEBUGGING
if (debug & 128)
fprintf(stderr,"0x%x: (%05d) malloc %d bytes\n",ptr,an++,size);
#endif
if (ptr != Nullch)
return ptr;
else {
fputs(nomem,stdout) FLUSH;
exit(1);
}
/*NOTREACHED*/
}
/* paranoid version of realloc */
char *
saferealloc(where,size)
char *where;
MEM_SIZE size;
{
char *ptr;
char *realloc();
ptr = realloc(where,size?size:1); /* realloc(0) is NASTY on our system */
#ifdef DEBUGGING
if (debug & 128) {
fprintf(stderr,"0x%x: (%05d) rfree\n",where,an++);
fprintf(stderr,"0x%x: (%05d) realloc %d bytes\n",ptr,an++,size);
}
#endif
if (ptr != Nullch)
return ptr;
else {
fputs(nomem,stdout) FLUSH;
exit(1);
}
/*NOTREACHED*/
}
/* safe version of free */
safefree(where)
char *where;
{
#ifdef DEBUGGING
if (debug & 128)
fprintf(stderr,"0x%x: (%05d) free\n",where,an++);
#endif
free(where);
}
/* safe version of string copy */
char *
safecpy(to,from,len)
char *to;
register char *from;
register int len;
{
register char *dest = to;
if (from != Nullch)
for (len--; len && (*dest++ = *from++); len--) ;
*dest = '\0';
return to;
}
#ifdef undef
/* safe version of string concatenate, with \n deletion and space padding */
char *
safecat(to,from,len)
char *to;
register char *from;
register int len;
{
register char *dest = to;
len--; /* leave room for null */
if (*dest) {
while (len && *dest++) len--;
if (len) {
len--;
*(dest-1) = ' ';
}
}
if (from != Nullch)
while (len && (*dest++ = *from++)) len--;
if (len)
dest--;
if (*(dest-1) == '\n')
dest--;
*dest = '\0';
return to;
}
#endif
/* copy a string up to some (non-backslashed) delimiter, if any */
char *
cpytill(to,from,delim)
register char *to, *from;
register int delim;
{
for (; *from; from++,to++) {
if (*from == '\\' && from[1] == delim)
*to++ = *from++;
else if (*from == delim)
break;
*to = *from;
}
*to = '\0';
return from;
}
char *
cpy2(to,from,delim)
register char *to, *from;
register int delim;
{
for (; *from; from++,to++) {
if (*from == '\\' && from[1] == delim)
*to++ = *from++;
else if (*from == '$')
*to++ = '\\';
else if (*from == delim)
break;
*to = *from;
}
*to = '\0';
return from;
}
/* return ptr to little string in big string, NULL if not found */
char *
instr(big, little)
char *big, *little;
{
register char *t, *s, *x;
for (t = big; *t; t++) {
for (x=t,s=little; *s; x++,s++) {
if (!*x)
return Nullch;
if (*s != *x)
break;
}
if (!*s)
return t;
}
return Nullch;
}
/* copy a string to a safe spot */
char *
savestr(str)
char *str;
{
register char *newaddr = safemalloc((MEM_SIZE)(strlen(str)+1));
(void)strcpy(newaddr,str);
return newaddr;
}
/* grow a static string to at least a certain length */
void
growstr(strptr,curlen,newlen)
char **strptr;
int *curlen;
int newlen;
{
if (newlen > *curlen) { /* need more room? */
if (*curlen)
*strptr = saferealloc(*strptr,(MEM_SIZE)newlen);
else
*strptr = safemalloc((MEM_SIZE)newlen);
*curlen = newlen;
}
}
/*VARARGS1*/
fatal(pat,a1,a2,a3,a4)
char *pat;
{
fprintf(stderr,pat,a1,a2,a3,a4);
exit(1);
}
static bool firstsetenv = TRUE;
extern char **environ;
void
setenv(nam,val)
char *nam, *val;
{
register int i=envix(nam); /* where does it go? */
if (!environ[i]) { /* does not exist yet */
if (firstsetenv) { /* need we copy environment? */
int j;
#ifndef lint
char **tmpenv = (char**) /* point our wand at memory */
safemalloc((i+2) * sizeof(char*));
#else
char **tmpenv = Null(char **);
#endif /* lint */
firstsetenv = FALSE;
for (j=0; j<i; j++) /* copy environment */
tmpenv[j] = environ[j];
environ = tmpenv; /* tell exec where it is now */
}
#ifndef lint
else
environ = (char**) saferealloc((char*) environ,
(i+2) * sizeof(char*));
/* just expand it a bit */
#endif /* lint */
environ[i+1] = Nullch; /* make sure it's null terminated */
}
environ[i] = safemalloc(strlen(nam) + strlen(val) + 2);
/* this may or may not be in */
/* the old environ structure */
sprintf(environ[i],"%s=%s",nam,val);/* all that work just for this */
}
int
envix(nam)
char *nam;
{
register int i, len = strlen(nam);
for (i = 0; environ[i]; i++) {
if (strnEQ(environ[i],nam,len) && environ[i][len] == '=')
break; /* strnEQ must come first to avoid */
} /* potential SEGV's */
return i;
}
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