2004-05-13 08:41:07 +02:00
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/* String intrinsics helper functions.
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Copyright 2002 Free Software Foundation, Inc.
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Contributed by Paul Brook <paul@nowt.org>
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This file is part of the GNU Fortran 95 runtime library (libgfor).
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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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 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 Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with libgfor; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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/* Unlike what the name of this file suggests, we don't actually
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implement the Fortran intrinsics here. At least, not with the
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names they have in the standard. The functions here provide all
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the support we need for the standard string intrinsics, and the
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compiler translates the actual intrinsics calls to calls to
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functions in this file. */
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#include <stdlib.h>
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#include <string.h>
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#include "libgfortran.h"
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/* String functions. */
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#define copy_string prefix(copy_string)
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void copy_string (GFC_INTEGER_4, char *, GFC_INTEGER_4, const char *);
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#define concat_string prefix(concat_string)
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void concat_string (GFC_INTEGER_4, char *,
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GFC_INTEGER_4, const char *,
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GFC_INTEGER_4, const char *);
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#define string_len_trim prefix(string_len_trim)
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GFC_INTEGER_4 string_len_trim (GFC_INTEGER_4, const char *);
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#define adjustl prefix(adjustl)
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void adjustl (char *, GFC_INTEGER_4, const char *);
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#define adjustr prefix(adjustr)
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void adjustr (char *, GFC_INTEGER_4, const char *);
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#define string_index prefix(string_index)
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GFC_INTEGER_4 string_index (GFC_INTEGER_4, const char *, GFC_INTEGER_4,
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const char *, GFC_LOGICAL_4);
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#define string_scan prefix(string_scan)
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GFC_INTEGER_4 string_scan (GFC_INTEGER_4, const char *, GFC_INTEGER_4,
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const char *, GFC_LOGICAL_4);
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#define string_verify prefix(string_verify)
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GFC_INTEGER_4 string_verify (GFC_INTEGER_4, const char *, GFC_INTEGER_4,
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const char *, GFC_LOGICAL_4);
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#define string_trim prefix(string_trim)
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void string_trim (GFC_INTEGER_4 *, void **, GFC_INTEGER_4, const char *);
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#define string_repeat prefix(string_repeat)
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void string_repeat (char *, GFC_INTEGER_4, const char *, GFC_INTEGER_4);
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/* The two areas may overlap so we use memmove. */
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void
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copy_string (GFC_INTEGER_4 destlen, char * dest,
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GFC_INTEGER_4 srclen, const char * src)
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{
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if (srclen >= destlen)
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{
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/* This will truncate if too long. */
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memmove (dest, src, destlen);
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/*memcpy (dest, src, destlen);*/
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}
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else
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{
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memmove (dest, src, srclen);
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/*memcpy (dest, src, srclen);*/
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/* Pad with spaces. */
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memset (&dest[srclen], ' ', destlen - srclen);
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}
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}
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/* Strings of unequal length are extended with pad characters. */
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GFC_INTEGER_4
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compare_string (GFC_INTEGER_4 len1, const char * s1,
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GFC_INTEGER_4 len2, const char * s2)
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{
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int res;
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const char *s;
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int len;
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res = strncmp (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 = &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 = &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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/* The destination and source should not overlap. */
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void
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concat_string (GFC_INTEGER_4 destlen, char * dest,
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GFC_INTEGER_4 len1, const char * s1,
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GFC_INTEGER_4 len2, const char * s2)
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{
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if (len1 >= destlen)
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{
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memcpy (dest, s1, destlen);
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return;
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}
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memcpy (dest, s1, len1);
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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);
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return;
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}
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memcpy (dest, s2, len2);
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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_INTEGER_4 * len, void ** dest, GFC_INTEGER_4 slen, const char * src)
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{
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int i;
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/* Determine length of result string. */
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for (i = slen - 1; i >= 0; i--)
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{
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if (src[i] != ' ')
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break;
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}
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*len = i + 1;
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if (*len > 0)
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{
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/* Allocate space for result string. */
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*dest = internal_malloc (*len);
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/* copy string if necessary. */
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memmove (*dest, src, *len);
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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_INTEGER_4
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string_len_trim (GFC_INTEGER_4 len, const char * s)
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{
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int i;
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for (i = len - 1; i >= 0; i--)
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{
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if (s[i] != ' ')
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break;
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}
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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_INTEGER_4
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string_index (GFC_INTEGER_4 slen, const char * str, GFC_INTEGER_4 sslen,
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const char * sstr, GFC_LOGICAL_4 back)
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{
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int start;
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int last;
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int i;
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int delta;
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if (sslen == 0)
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return 1;
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2004-08-25 02:14:07 +02:00
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if (sslen > slen)
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return 0;
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2004-05-13 08:41:07 +02:00
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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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i = 0;
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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 (char *dest, GFC_INTEGER_4 len, const char *src)
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{
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int 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);
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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 (char *dest, GFC_INTEGER_4 len, const char *src)
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{
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int i;
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i = len;
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while (i > 0 && src[i - 1] == ' ')
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2004-05-13 12:11:02 +02:00
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i--;
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2004-05-13 08:41:07 +02:00
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if (i < len)
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memset (dest, ' ', len - i);
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2004-05-13 12:11:02 +02:00
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memcpy (dest + (len - i), src, i );
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2004-05-13 08:41:07 +02:00
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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_INTEGER_4
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string_scan (GFC_INTEGER_4 slen, const char * str, GFC_INTEGER_4 setlen,
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const char * set, GFC_LOGICAL_4 back)
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{
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int start;
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int last;
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int i;
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int delta;
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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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last = 0;
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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 - 1;
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start = 0;
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delta = 1;
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}
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i = 0;
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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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return (start + 1);
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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 indentifying the position of the first character in a
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characters that dose not appear in a given set of characters. */
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GFC_INTEGER_4
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string_verify (GFC_INTEGER_4 slen, const char * str, GFC_INTEGER_4 setlen,
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const char * set, GFC_LOGICAL_4 back)
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{
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int start;
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int last;
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int i;
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int delta;
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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 = 0;
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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 - 1;
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start = 0;
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delta = 1;
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}
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i = 0;
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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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/* Concatenate several copies of a string. */
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void
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string_repeat (char * dest, GFC_INTEGER_4 slen,
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const char * src, GFC_INTEGER_4 ncopies)
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{
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int i;
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/* See if ncopies is valid. */
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if (ncopies < 0)
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{
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/* The error is already reported. */
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runtime_error ("Augument NCOPIES is negative.");
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}
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/* Copy characters. */
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for (i = 0; i < ncopies; i++)
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{
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memmove (dest + (i * slen), src, slen);
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}
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}
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