| /* Copyright (C) 2002-2025 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. |
| With the introduction of UNSIGNED integers, we must treat the case |
| of unsigned ints larger than (10^19 * 2^64) by adding one step. */ |
| _Static_assert (sizeof(GFC_UINTEGER_LARGEST) <= 2 * sizeof(uint64_t), |
| "integer too large"); |
| |
| if (n <= TEN19 * UINT64_MAX) |
| { |
| 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 |
| { |
| /* Here n > (10^19 * 2^64). */ |
| GFC_UINTEGER_LARGEST d1, r1, d2, r2; |
| d1 = n / (TEN19 * TEN19); |
| r1 = n % (TEN19 * TEN19); |
| d2 = r1 / TEN19; |
| r2 = r1 % TEN19; |
| p = itoa64_pad19 (r2, p); |
| p = itoa64_pad19 (d2, p); |
| return itoa64 (d1, p); |
| } |
| } |
| #else |
| /* On targets where the largest integer is 64-bit, just use that. */ |
| return itoa64 (n, p); |
| #endif |
| } |