minix/dist/nvi/common/util.c

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/* $NetBSD: util.c,v 1.4 2011/03/21 14:53:02 tnozaki Exp $ */
/*-
* Copyright (c) 1991, 1993, 1994
* The Regents of the University of California. All rights reserved.
* Copyright (c) 1991, 1993, 1994, 1995, 1996
* Keith Bostic. All rights reserved.
*
* See the LICENSE file for redistribution information.
*/
#include "config.h"
#ifndef lint
static const char sccsid[] = "Id: util.c,v 10.22 2001/06/25 15:19:12 skimo Exp (Berkeley) Date: 2001/06/25 15:19:12";
#endif /* not lint */
#include <sys/types.h>
#include <sys/queue.h>
#include <bitstring.h>
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "common.h"
/*
* binc --
* Increase the size of a buffer.
*
* PUBLIC: void *binc __P((SCR *, void *, size_t *, size_t));
*/
void *
binc(SCR *sp, void *bp, size_t *bsizep, size_t min)
/* sp MAY BE NULL!!! */
{
size_t csize;
/* If already larger than the minimum, just return. */
if (min && *bsizep >= min)
return (bp);
csize = *bsizep + MAX(min, 256);
REALLOC(sp, bp, void *, csize);
if (bp == NULL) {
/*
* Theoretically, realloc is supposed to leave any already
* held memory alone if it can't get more. Don't trust it.
*/
*bsizep = 0;
return (NULL);
}
/*
* Memory is guaranteed to be zero-filled, various parts of
* nvi depend on this.
*/
memset((char *)bp + *bsizep, 0, csize - *bsizep);
*bsizep = csize;
return (bp);
}
/*
* nonblank --
* Set the column number of the first non-blank character
* including or after the starting column. On error, set
* the column to 0, it's safest.
*
* PUBLIC: int nonblank __P((SCR *, db_recno_t, size_t *));
*/
int
nonblank(SCR *sp, db_recno_t lno, size_t *cnop)
{
CHAR_T *p;
size_t cnt, len, off;
int isempty;
/* Default. */
off = *cnop;
*cnop = 0;
/* Get the line, succeeding in an empty file. */
if (db_eget(sp, lno, &p, &len, &isempty))
return (!isempty);
/* Set the offset. */
if (len == 0 || off >= len)
return (0);
for (cnt = off, p = &p[off],
len -= off; len && ISBLANK((UCHAR_T)*p); ++cnt, ++p, --len);
/* Set the return. */
*cnop = len ? cnt : cnt - 1;
return (0);
}
/*
* tail --
* Return tail of a path.
*
* PUBLIC: char *tail __P((char *));
*/
const char *
tail(const char *path)
{
const char *p;
if ((p = strrchr(path, '/')) == NULL)
return (path);
return (p + 1);
}
/*
* v_strdup --
* Strdup for wide character strings with an associated length.
*
* PUBLIC: char *v_strdup __P((SCR *, const char *, size_t));
*/
char *
v_strdup(SCR *sp, const char *str, size_t len)
{
char *copy;
MALLOC(sp, copy, char *, (len + 1));
if (copy == NULL)
return (NULL);
memcpy(copy, str, len);
copy[len] = '\0';
return (copy);
}
/*
* v_strdup --
* Strdup for wide character strings with an associated length.
*
* PUBLIC: CHAR_T *v_wstrdup __P((SCR *, const CHAR_T *, size_t));
*/
CHAR_T *
v_wstrdup(SCR *sp, const CHAR_T *str, size_t len)
{
CHAR_T *copy;
MALLOC(sp, copy, CHAR_T *, (len + 1) * sizeof(CHAR_T));
if (copy == NULL)
return (NULL);
MEMCPYW(copy, str, len);
copy[len] = '\0';
return (copy);
}
/*
* nget_uslong --
* Get an unsigned long, checking for overflow.
*
* PUBLIC: enum nresult nget_uslong __P((SCR *, u_long *, const CHAR_T *, CHAR_T **, int));
*/
enum nresult
nget_uslong(SCR *sp, u_long *valp, const CHAR_T *p, CHAR_T **endp, int base)
{
errno = 0;
*valp = STRTOUL(p, (RCHAR_T **)endp, base);
if (errno == 0)
return (NUM_OK);
if (errno == ERANGE && *valp == ULONG_MAX)
return (NUM_OVER);
return (NUM_ERR);
}
/*
* nget_slong --
* Convert a signed long, checking for overflow and underflow.
*
* PUBLIC: enum nresult nget_slong __P((SCR *, long *, const CHAR_T *, CHAR_T **, int));
*/
enum nresult
nget_slong(SCR *sp, long int *valp, const CHAR_T *p, CHAR_T **endp, int base)
{
errno = 0;
*valp = STRTOL(p, (RCHAR_T **)endp, base);
if (errno == 0)
return (NUM_OK);
if (errno == ERANGE) {
if (*valp == LONG_MAX)
return (NUM_OVER);
if (*valp == LONG_MIN)
return (NUM_UNDER);
}
return (NUM_ERR);
}