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/* Copyright (C) 2002-2022 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 <assert.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;
}
/* Fast helper function for a positive value that fits in uint64_t. */
static inline char *
itoa64 (uint64_t n, char *p)
{
while (n != 0)
{
*--p = '0' + (n % 10);
n /= 10;
}
return p;
}
#if defined(HAVE_GFC_INTEGER_16)
# define TEN19 ((GFC_UINTEGER_LARGEST) 1000000 * (GFC_UINTEGER_LARGEST) 1000000 * (GFC_UINTEGER_LARGEST) 10000000)
/* Same as itoa64(), with zero padding of 19 digits. */
static inline char *
itoa64_pad19 (uint64_t n, char *p)
{
for (int k = 0; k < 19; k++)
{
*--p = '0' + (n % 10);
n /= 10;
}
return p;
}
#endif
/* Integer to decimal conversion.
This function is much more restricted than the widespread (but
non-standard) itoa() function. This version has the following
characteristics:
- it takes only non-negative arguments
- it is async-signal-safe (we use it runtime/backtrace.c)
- it works in base 10 (see xtoa, otoa, btoa functions
in io/write.c for other radices)
*/
const char *
gfc_itoa (GFC_UINTEGER_LARGEST n, char *buffer, size_t len)
{
char *p;
if (len < GFC_ITOA_BUF_SIZE)
sys_abort ();
if (n == 0)
return "0";
p = buffer + GFC_ITOA_BUF_SIZE - 1;
*p = '\0';
#if defined(HAVE_GFC_INTEGER_16)
/* On targets that have a 128-bit integer type, division in that type
is slow, because it occurs through a function call. We avoid that. */
if (n <= UINT64_MAX)
/* If the value fits in uint64_t, use the fast function. */
return itoa64 (n, p);
else
{
/* Otherwise, break down into smaller bits by division. Two calls to
the uint64_t function are not sufficient for all 128-bit unsigned
integers (we would need three calls), but they do suffice for all
values up to 2^127, which is the largest that Fortran can produce
(-HUGE(0_16)-1) with its signed integer types. */
_Static_assert (sizeof(GFC_UINTEGER_LARGEST) <= 2 * sizeof(uint64_t),
"integer too large");
GFC_UINTEGER_LARGEST r;
r = n % TEN19;
n = n / TEN19;
assert (r <= UINT64_MAX);
p = itoa64_pad19 (r, p);
assert(n <= UINT64_MAX);
return itoa64 (n, p);
}
#else
/* On targets where the largest integer is 64-bit, just use that. */
return itoa64 (n, p);
#endif
}
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