Coverage Report

Created: 2022-02-19 20:29

/src/php-src/ext/standard/strnatcmp.c
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/*
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  Modified for PHP by Andrei Zmievski <andrei@ispi.net>
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  strnatcmp.c -- Perform 'natural order' comparisons of strings in C.
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  Copyright (C) 2000 by Martin Pool <mbp@humbug.org.au>
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  This software is provided 'as-is', without any express or implied
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  warranty.  In no event will the authors be held liable for any damages
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  arising from the use of this software.
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  Permission is granted to anyone to use this software for any purpose,
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  including commercial applications, and to alter it and redistribute it
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  freely, subject to the following restrictions:
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  1. The origin of this software must not be misrepresented; you must not
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     claim that you wrote the original software. If you use this software
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     in a product, an acknowledgment in the product documentation would be
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     appreciated but is not required.
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  2. Altered source versions must be plainly marked as such, and must not be
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     misrepresented as being the original software.
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  3. This notice may not be removed or altered from any source distribution.
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*/
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#include <ctype.h>
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#include <string.h>
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#include <stdio.h>
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#include "php.h"
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#include "php_string.h"
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/* {{{ compare_right */
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static int
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compare_right(char const **a, char const *aend, char const **b, char const *bend)
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{
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  int bias = 0;
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  /* The longest run of digits wins.  That aside, the greatest
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     value wins, but we can't know that it will until we've scanned
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     both numbers to know that they have the same magnitude, so we
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     remember it in BIAS. */
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  for(;; (*a)++, (*b)++) {
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    if ((*a == aend || !isdigit((int)(unsigned char)**a)) &&
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      (*b == bend || !isdigit((int)(unsigned char)**b)))
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      return bias;
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    else if (*a == aend || !isdigit((int)(unsigned char)**a))
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      return -1;
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    else if (*b == bend || !isdigit((int)(unsigned char)**b))
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      return +1;
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    else if (**a < **b) {
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      if (!bias)
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        bias = -1;
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    } else if (**a > **b) {
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      if (!bias)
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        bias = +1;
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    }
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     }
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     return 0;
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0
}
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/* }}} */
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/* {{{ compare_left */
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static int
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compare_left(char const **a, char const *aend, char const **b, char const *bend)
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0
{
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     /* Compare two left-aligned numbers: the first to have a
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        different value wins. */
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  for(;; (*a)++, (*b)++) {
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    if ((*a == aend || !isdigit((int)(unsigned char)**a)) &&
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      (*b == bend || !isdigit((int)(unsigned char)**b)))
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      return 0;
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    else if (*a == aend || !isdigit((int)(unsigned char)**a))
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      return -1;
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    else if (*b == bend || !isdigit((int)(unsigned char)**b))
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      return +1;
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     else if (**a < **b)
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       return -1;
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     else if (**a > **b)
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       return +1;
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     }
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     return 0;
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0
}
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/* }}} */
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/* {{{ strnatcmp_ex */
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PHPAPI int strnatcmp_ex(char const *a, size_t a_len, char const *b, size_t b_len, int fold_case)
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{
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  unsigned char ca, cb;
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  char const *ap, *bp;
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  char const *aend = a + a_len,
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         *bend = b + b_len;
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  int fractional, result;
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  short leading = 1;
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  if (a_len == 0 || b_len == 0) {
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    return (a_len == b_len ? 0 : (a_len > b_len ? 1 : -1));
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  }
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  ap = a;
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  bp = b;
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  while (1) {
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    ca = *ap; cb = *bp;
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    /* skip over leading zeros */
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    while (leading && ca == '0' && (ap+1 < aend) && isdigit((int)(unsigned char)*(ap+1))) {
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      ca = *++ap;
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    }
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    while (leading && cb == '0' && (bp+1 < bend) && isdigit((int)(unsigned char)*(bp+1))) {
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      cb = *++bp;
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    }
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    leading = 0;
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    /* Skip consecutive whitespace */
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    while (isspace((int)(unsigned char)ca)) {
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      ca = *++ap;
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    }
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    while (isspace((int)(unsigned char)cb)) {
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      cb = *++bp;
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    }
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    /* process run of digits */
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    if (isdigit((int)(unsigned char)ca)  &&  isdigit((int)(unsigned char)cb)) {
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      fractional = (ca == '0' || cb == '0');
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      if (fractional)
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        result = compare_left(&ap, aend, &bp, bend);
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      else
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        result = compare_right(&ap, aend, &bp, bend);
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      if (result != 0)
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        return result;
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      else if (ap == aend && bp == bend)
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        /* End of the strings. Let caller sort them out. */
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        return 0;
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      else if (ap == aend)
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        return -1;
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      else if (bp == bend)
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        return 1;
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      else {
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        /* Keep on comparing from the current point. */
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        ca = *ap; cb = *bp;
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      }
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    }
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    if (fold_case) {
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      ca = toupper((int)(unsigned char)ca);
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      cb = toupper((int)(unsigned char)cb);
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    }
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    if (ca < cb)
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      return -1;
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    else if (ca > cb)
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      return +1;
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    ++ap; ++bp;
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    if (ap >= aend && bp >= bend)
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      /* The strings compare the same.  Perhaps the caller
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         will want to call strcmp to break the tie. */
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      return 0;
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    else if (ap >= aend)
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      return -1;
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    else if (bp >= bend)
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      return 1;
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  }
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}
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/* }}} */