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451 lines
10 KiB
C
451 lines
10 KiB
C
/* String intrinsics helper functions.
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Copyright (C) 2002-2014 Free Software Foundation, Inc.
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This file is part of the GNU Fortran runtime library (libgfortran).
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Libgfortran is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public
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License as published by the Free Software Foundation; either
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version 3 of the License, or (at your option) any later version.
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Libgfortran is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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/* Rename the functions. */
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#define concat_string SUFFIX(concat_string)
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#define string_len_trim SUFFIX(string_len_trim)
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#define adjustl SUFFIX(adjustl)
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#define adjustr SUFFIX(adjustr)
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#define string_index SUFFIX(string_index)
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#define string_scan SUFFIX(string_scan)
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#define string_verify SUFFIX(string_verify)
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#define string_trim SUFFIX(string_trim)
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#define string_minmax SUFFIX(string_minmax)
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#define zero_length_string SUFFIX(zero_length_string)
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#define compare_string SUFFIX(compare_string)
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/* The prototypes. */
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extern void concat_string (gfc_charlen_type, CHARTYPE *,
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gfc_charlen_type, const CHARTYPE *,
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gfc_charlen_type, const CHARTYPE *);
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export_proto(concat_string);
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extern void adjustl (CHARTYPE *, gfc_charlen_type, const CHARTYPE *);
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export_proto(adjustl);
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extern void adjustr (CHARTYPE *, gfc_charlen_type, const CHARTYPE *);
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export_proto(adjustr);
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extern gfc_charlen_type string_index (gfc_charlen_type, const CHARTYPE *,
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gfc_charlen_type, const CHARTYPE *,
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GFC_LOGICAL_4);
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export_proto(string_index);
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extern gfc_charlen_type string_scan (gfc_charlen_type, const CHARTYPE *,
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gfc_charlen_type, const CHARTYPE *,
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GFC_LOGICAL_4);
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export_proto(string_scan);
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extern gfc_charlen_type string_verify (gfc_charlen_type, const CHARTYPE *,
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gfc_charlen_type, const CHARTYPE *,
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GFC_LOGICAL_4);
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export_proto(string_verify);
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extern void string_trim (gfc_charlen_type *, CHARTYPE **, gfc_charlen_type,
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const CHARTYPE *);
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export_proto(string_trim);
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extern void string_minmax (gfc_charlen_type *, CHARTYPE **, int, int, ...);
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export_proto(string_minmax);
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/* Use for functions which can return a zero-length string. */
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static CHARTYPE zero_length_string = 0;
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/* Strings of unequal length are extended with pad characters. */
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int
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compare_string (gfc_charlen_type len1, const CHARTYPE *s1,
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gfc_charlen_type len2, const CHARTYPE *s2)
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{
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const UCHARTYPE *s;
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gfc_charlen_type len;
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int res;
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res = MEMCMP (s1, s2, ((len1 < len2) ? len1 : len2));
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if (res != 0)
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return res;
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if (len1 == len2)
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return 0;
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if (len1 < len2)
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{
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len = len2 - len1;
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s = (UCHARTYPE *) &s2[len1];
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res = -1;
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}
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else
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{
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len = len1 - len2;
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s = (UCHARTYPE *) &s1[len2];
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res = 1;
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}
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while (len--)
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{
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if (*s != ' ')
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{
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if (*s > ' ')
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return res;
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else
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return -res;
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}
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s++;
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}
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return 0;
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}
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iexport(compare_string);
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/* The destination and source should not overlap. */
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void
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concat_string (gfc_charlen_type destlen, CHARTYPE * dest,
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gfc_charlen_type len1, const CHARTYPE * s1,
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gfc_charlen_type len2, const CHARTYPE * s2)
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{
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if (len1 >= destlen)
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{
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memcpy (dest, s1, destlen * sizeof (CHARTYPE));
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return;
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}
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memcpy (dest, s1, len1 * sizeof (CHARTYPE));
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dest += len1;
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destlen -= len1;
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if (len2 >= destlen)
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{
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memcpy (dest, s2, destlen * sizeof (CHARTYPE));
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return;
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}
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memcpy (dest, s2, len2 * sizeof (CHARTYPE));
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MEMSET (&dest[len2], ' ', destlen - len2);
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}
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/* Return string with all trailing blanks removed. */
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void
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string_trim (gfc_charlen_type *len, CHARTYPE **dest, gfc_charlen_type slen,
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const CHARTYPE *src)
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{
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*len = string_len_trim (slen, src);
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if (*len == 0)
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*dest = &zero_length_string;
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else
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{
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/* Allocate space for result string. */
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*dest = xmalloc (*len * sizeof (CHARTYPE));
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/* Copy string if necessary. */
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memcpy (*dest, src, *len * sizeof (CHARTYPE));
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}
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}
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/* The length of a string not including trailing blanks. */
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gfc_charlen_type
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string_len_trim (gfc_charlen_type len, const CHARTYPE *s)
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{
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const gfc_charlen_type long_len = (gfc_charlen_type) sizeof (unsigned long);
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gfc_charlen_type i;
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i = len - 1;
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/* If we've got the standard (KIND=1) character type, we scan the string in
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long word chunks to speed it up (until a long word is hit that does not
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consist of ' 's). */
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if (sizeof (CHARTYPE) == 1 && i >= long_len)
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{
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int starting;
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unsigned long blank_longword;
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/* Handle the first characters until we're aligned on a long word
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boundary. Actually, s + i + 1 must be properly aligned, because
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s + i will be the last byte of a long word read. */
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starting = ((unsigned long)
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#ifdef __INTPTR_TYPE__
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(__INTPTR_TYPE__)
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#endif
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(s + i + 1)) % long_len;
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i -= starting;
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for (; starting > 0; --starting)
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if (s[i + starting] != ' ')
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return i + starting + 1;
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/* Handle the others in a batch until first non-blank long word is
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found. Here again, s + i is the last byte of the current chunk,
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to it starts at s + i - sizeof (long) + 1. */
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#if __SIZEOF_LONG__ == 4
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blank_longword = 0x20202020L;
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#elif __SIZEOF_LONG__ == 8
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blank_longword = 0x2020202020202020L;
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#else
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#error Invalid size of long!
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#endif
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while (i >= long_len)
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{
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i -= long_len;
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if (*((unsigned long*) (s + i + 1)) != blank_longword)
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{
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i += long_len;
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break;
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}
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}
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/* Now continue for the last characters with naive approach below. */
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assert (i >= 0);
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}
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/* Simply look for the first non-blank character. */
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while (i >= 0 && s[i] == ' ')
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--i;
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return i + 1;
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}
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/* Find a substring within a string. */
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gfc_charlen_type
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string_index (gfc_charlen_type slen, const CHARTYPE *str,
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gfc_charlen_type sslen, const CHARTYPE *sstr,
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GFC_LOGICAL_4 back)
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{
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gfc_charlen_type start, last, delta, i;
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if (sslen == 0)
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return back ? (slen + 1) : 1;
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if (sslen > slen)
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return 0;
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if (!back)
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{
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last = slen + 1 - sslen;
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start = 0;
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delta = 1;
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}
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else
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{
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last = -1;
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start = slen - sslen;
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delta = -1;
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}
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for (; start != last; start+= delta)
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{
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for (i = 0; i < sslen; i++)
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{
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if (str[start + i] != sstr[i])
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break;
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}
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if (i == sslen)
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return (start + 1);
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}
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return 0;
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}
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/* Remove leading blanks from a string, padding at end. The src and dest
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should not overlap. */
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void
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adjustl (CHARTYPE *dest, gfc_charlen_type len, const CHARTYPE *src)
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{
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gfc_charlen_type i;
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i = 0;
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while (i < len && src[i] == ' ')
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i++;
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if (i < len)
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memcpy (dest, &src[i], (len - i) * sizeof (CHARTYPE));
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if (i > 0)
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MEMSET (&dest[len - i], ' ', i);
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}
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/* Remove trailing blanks from a string. */
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void
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adjustr (CHARTYPE *dest, gfc_charlen_type len, const CHARTYPE *src)
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{
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gfc_charlen_type i;
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i = len;
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while (i > 0 && src[i - 1] == ' ')
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i--;
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if (i < len)
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MEMSET (dest, ' ', len - i);
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memcpy (&dest[len - i], src, i * sizeof (CHARTYPE));
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}
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/* Scan a string for any one of the characters in a set of characters. */
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gfc_charlen_type
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string_scan (gfc_charlen_type slen, const CHARTYPE *str,
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gfc_charlen_type setlen, const CHARTYPE *set, GFC_LOGICAL_4 back)
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{
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gfc_charlen_type i, j;
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if (slen == 0 || setlen == 0)
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return 0;
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if (back)
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{
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for (i = slen - 1; i >= 0; i--)
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{
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for (j = 0; j < setlen; j++)
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{
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if (str[i] == set[j])
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return (i + 1);
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}
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}
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}
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else
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{
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for (i = 0; i < slen; i++)
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{
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for (j = 0; j < setlen; j++)
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{
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if (str[i] == set[j])
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return (i + 1);
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}
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}
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}
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return 0;
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}
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/* Verify that a set of characters contains all the characters in a
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string by identifying the position of the first character in a
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characters that does not appear in a given set of characters. */
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gfc_charlen_type
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string_verify (gfc_charlen_type slen, const CHARTYPE *str,
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gfc_charlen_type setlen, const CHARTYPE *set,
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GFC_LOGICAL_4 back)
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{
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gfc_charlen_type start, last, delta, i;
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if (slen == 0)
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return 0;
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if (back)
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{
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last = -1;
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start = slen - 1;
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delta = -1;
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}
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else
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{
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last = slen;
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start = 0;
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delta = 1;
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}
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for (; start != last; start += delta)
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{
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for (i = 0; i < setlen; i++)
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{
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if (str[start] == set[i])
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break;
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}
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if (i == setlen)
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return (start + 1);
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}
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return 0;
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}
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/* MIN and MAX intrinsics for strings. The front-end makes sure that
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nargs is at least 2. */
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void
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string_minmax (gfc_charlen_type *rlen, CHARTYPE **dest, int op, int nargs, ...)
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{
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va_list ap;
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int i;
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CHARTYPE *next, *res;
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gfc_charlen_type nextlen, reslen;
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va_start (ap, nargs);
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reslen = va_arg (ap, gfc_charlen_type);
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res = va_arg (ap, CHARTYPE *);
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*rlen = reslen;
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if (res == NULL)
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runtime_error ("First argument of '%s' intrinsic should be present",
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op > 0 ? "MAX" : "MIN");
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for (i = 1; i < nargs; i++)
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{
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nextlen = va_arg (ap, gfc_charlen_type);
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next = va_arg (ap, CHARTYPE *);
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if (next == NULL)
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{
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if (i == 1)
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runtime_error ("Second argument of '%s' intrinsic should be "
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"present", op > 0 ? "MAX" : "MIN");
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else
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continue;
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}
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if (nextlen > *rlen)
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*rlen = nextlen;
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if (op * compare_string (reslen, res, nextlen, next) < 0)
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{
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reslen = nextlen;
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res = next;
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}
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}
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va_end (ap);
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if (*rlen == 0)
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*dest = &zero_length_string;
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else
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{
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CHARTYPE *tmp = xmalloc (*rlen * sizeof (CHARTYPE));
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memcpy (tmp, res, reslen * sizeof (CHARTYPE));
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MEMSET (&tmp[reslen], ' ', *rlen - reslen);
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*dest = tmp;
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}
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}
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