/*      $OpenBSD: util.c,v 1.17 2018/07/11 06:39:23 martijn 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"

#include <sys/queue.h>

#include <bitstring.h>
#include <ctype.h>
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "common.h"

#define MAXIMUM(a, b)   (((a) > (b)) ? (a) : (b))

/*
 * binc --
 *      Increase the size of a buffer.
 *
 * PUBLIC: void *binc(SCR *, void *, size_t *, size_t);
 */
void *
binc(SCR *sp, void *bp, size_t *bsizep, size_t min)
{
        size_t csize;

        /* If already larger than the minimum, just return. */
        if (min && *bsizep >= min)
                return (bp);

        csize = *bsizep + MAXIMUM(min, 256);
        REALLOC(sp, bp, csize);

        if (bp == NULL) {
                *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(SCR *, recno_t, size_t *);
 */
int
nonblank(SCR *sp, recno_t lno, size_t *cnop)
{
        char *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(*p); ++cnt, ++p, --len);

        /* Set the return. */
        *cnop = len ? cnt : cnt - 1;
        return (0);
}

/*
 * v_strdup --
 *      Strdup for wide character strings with an associated length.
 *
 * PUBLIC: CHAR_T *v_strdup(SCR *, const CHAR_T *, size_t);
 */
CHAR_T *
v_strdup(SCR *sp, const CHAR_T *str, size_t len)
{
        CHAR_T *copy;

        MALLOC(sp, copy, len + 1);
        if (copy == NULL)
                return (NULL);
        memcpy(copy, str, len * sizeof(CHAR_T));
        copy[len] = '\0';
        return (copy);
}

/*
 * nget_uslong --
 *      Get an unsigned long, checking for overflow.
 *
 * PUBLIC: enum nresult nget_uslong(u_long *, const char *, char **, int);
 */
enum nresult
nget_uslong(u_long *valp, const char *p, char **endp, int base)
{
        errno = 0;
        *valp = strtoul(p, 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(long *, const char *, char **, int);
 */
enum nresult
nget_slong(long *valp, const char *p, char **endp, int base)
{
        errno = 0;
        *valp = strtol(p, 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);
}

#ifdef DEBUG
#include <stdarg.h>

/*
 * TRACE --
 *      debugging trace routine.
 *
 * PUBLIC: void TRACE(SCR *, const char *, ...);
 */
void
TRACE(SCR *sp, const char *fmt, ...)
{
        FILE *tfp;
        va_list ap;

        if ((tfp = sp->gp->tracefp) == NULL)
                return;
        va_start(ap, fmt);
        (void)vfprintf(tfp, fmt, ap);
        fflush(tfp);
        va_end(ap);

        (void)fflush(tfp);
}
#endif