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/* Copyright (C) 2002-2020 Free Software Foundation, Inc.
Contributed by Paul Brook
This file is part of the GNU Fortran runtime library (libgfortran).
Libgfortran is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
Libgfortran is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
#include "libgfortran.h"
#include <string.h>
#include <strings.h>
/* Given a fortran string, return its length exclusive of the trailing
spaces. */
gfc_charlen_type
fstrlen (const char *string, gfc_charlen_type len)
{
for (; len > 0; len--)
if (string[len-1] != ' ')
break;
return len;
}
/* Copy a Fortran string (not null-terminated, hence length arguments
for both source and destination strings. Returns the non-padded
length of the destination. */
gfc_charlen_type
fstrcpy (char *dest, gfc_charlen_type destlen,
const char *src, gfc_charlen_type srclen)
{
if (srclen >= destlen)
{
/* This will truncate if too long. */
memcpy (dest, src, destlen);
return destlen;
}
else
{
memcpy (dest, src, srclen);
/* Pad with spaces. */
memset (&dest[srclen], ' ', destlen - srclen);
return srclen;
}
}
/* Copy a null-terminated C string to a non-null-terminated Fortran
string. Returns the non-padded length of the destination string. */
gfc_charlen_type
cf_strcpy (char *dest, gfc_charlen_type dest_len, const char *src)
{
size_t src_len;
src_len = strlen (src);
if (src_len >= (size_t) dest_len)
{
/* This will truncate if too long. */
memcpy (dest, src, dest_len);
return dest_len;
}
else
{
memcpy (dest, src, src_len);
/* Pad with spaces. */
memset (&dest[src_len], ' ', dest_len - src_len);
return src_len;
}
}
#ifndef HAVE_STRNLEN
static size_t
strnlen (const char *s, size_t maxlen)
{
for (size_t ii = 0; ii < maxlen; ii++)
{
if (s[ii] == '\0')
return ii;
}
return maxlen;
}
#endif
#ifndef HAVE_STRNDUP
static char *
strndup (const char *s, size_t n)
{
size_t len = strnlen (s, n);
char *p = malloc (len + 1);
if (!p)
return NULL;
memcpy (p, s, len);
p[len] = '\0';
return p;
}
#endif
/* Duplicate a non-null-terminated Fortran string to a malloced
null-terminated C string. */
char *
fc_strdup (const char *src, gfc_charlen_type src_len)
{
gfc_charlen_type n = fstrlen (src, src_len);
char *p = strndup (src, n);
if (!p)
os_error ("Memory allocation failed in fc_strdup");
return p;
}
/* Duplicate a non-null-terminated Fortran string to a malloced
null-terminated C string, without getting rid of trailing
blanks. */
char *
fc_strdup_notrim (const char *src, gfc_charlen_type src_len)
{
char *p = strndup (src, src_len);
if (!p)
os_error ("Memory allocation failed in fc_strdup");
return p;
}
/* Given a fortran string and an array of st_option structures, search through
the array to find a match. If the option is not found, we generate an error
if no default is provided. */
int
find_option (st_parameter_common *cmp, const char *s1, gfc_charlen_type s1_len,
const st_option * opts, const char *error_message)
{
/* Strip trailing blanks from the Fortran string. */
size_t len = (size_t) fstrlen (s1, s1_len);
for (; opts->name; opts++)
if (len == strlen(opts->name) && strncasecmp (s1, opts->name, len) == 0)
return opts->value;
generate_error (cmp, LIBERROR_BAD_OPTION, error_message);
return -1;
}
/* gfc_itoa()-- Integer to decimal conversion.
The itoa function is a widespread non-standard extension to
standard C, often declared in <stdlib.h>. Even though the itoa
defined here is a static function we take care not to conflict with
any prior non-static declaration. Hence the 'gfc_' prefix, which
is normally reserved for functions with external linkage. Notably,
in contrast to the *printf() family of functions, this ought to be
async-signal-safe. */
const char *
gfc_itoa (GFC_INTEGER_LARGEST n, char *buffer, size_t len)
{
int negative;
char *p;
GFC_UINTEGER_LARGEST t;
if (len < GFC_ITOA_BUF_SIZE)
sys_abort ();
if (n == 0)
return "0";
negative = 0;
t = n;
if (n < 0)
{
negative = 1;
t = -n; /*must use unsigned to protect from overflow*/
}
p = buffer + GFC_ITOA_BUF_SIZE - 1;
*p = '\0';
while (t != 0)
{
*--p = '0' + (t % 10);
t /= 10;
}
if (negative)
*--p = '-';
return p;
}
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