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format.c
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/* Copyright (C) 2002-2021 Free Software Foundation, Inc.
Contributed by Andy Vaught
F2003 I/O support contributed by Jerry DeLisle
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/>. */
/* format.c-- parse a FORMAT string into a binary format suitable for
interpretation during I/O statements. */
#include "io.h"
#include "format.h"
#include <ctype.h>
#include <string.h>
static const fnode colon_node = { FMT_COLON, 0, NULL, NULL, {{ 0, 0, 0 }}, 0,
NULL };
/* Error messages. */
static const char posint_required[] = "Positive integer required in format",
period_required[] = "Period required in format",
nonneg_required[] = "Nonnegative width required in format",
unexpected_element[] = "Unexpected element '%c' in format\n",
unexpected_end[] = "Unexpected end of format string",
bad_string[] = "Unterminated character constant in format",
bad_hollerith[] = "Hollerith constant extends past the end of the format",
reversion_error[] = "Exhausted data descriptors in format",
zero_width[] = "Zero width in format descriptor";
/* The following routines support caching format data from parsed format strings
into a hash table. This avoids repeatedly parsing duplicate format strings
or format strings in I/O statements that are repeated in loops. */
/* Traverse the table and free all data. */
void
free_format_hash_table (gfc_unit *u)
{
size_t i;
/* free_format_data handles any NULL pointers. */
for (i = 0; i < FORMAT_HASH_SIZE; i++)
{
if (u->format_hash_table[i].hashed_fmt != NULL)
{
free_format_data (u->format_hash_table[i].hashed_fmt);
free (u->format_hash_table[i].key);
}
u->format_hash_table[i].key = NULL;
u->format_hash_table[i].key_len = 0;
u->format_hash_table[i].hashed_fmt = NULL;
}
}
/* Traverse the format_data structure and reset the fnode counters. */
static void
reset_node (fnode *fn)
{
fnode *f;
fn->count = 0;
fn->current = NULL;
if (fn->format != FMT_LPAREN)
return;
for (f = fn->u.child; f; f = f->next)
{
if (f->format == FMT_RPAREN)
break;
reset_node (f);
}
}
static void
reset_fnode_counters (st_parameter_dt *dtp)
{
fnode *f;
format_data *fmt;
fmt = dtp->u.p.fmt;
/* Clear this pointer at the head so things start at the right place. */
fmt->array.array[0].current = NULL;
for (f = fmt->array.array[0].u.child; f; f = f->next)
reset_node (f);
}
/* A simple hashing function to generate an index into the hash table. */
static uint32_t
format_hash (st_parameter_dt *dtp)
{
char *key;
gfc_charlen_type key_len;
uint32_t hash = 0;
gfc_charlen_type i;
/* Hash the format string. Super simple, but what the heck! */
key = dtp->format;
key_len = dtp->format_len;
for (i = 0; i < key_len; i++)
hash ^= key[i];
hash &= (FORMAT_HASH_SIZE - 1);
return hash;
}
static void
save_parsed_format (st_parameter_dt *dtp)
{
uint32_t hash;
gfc_unit *u;
hash = format_hash (dtp);
u = dtp->u.p.current_unit;
/* Index into the hash table. We are simply replacing whatever is there
relying on probability. */
if (u->format_hash_table[hash].hashed_fmt != NULL)
free_format_data (u->format_hash_table[hash].hashed_fmt);
u->format_hash_table[hash].hashed_fmt = NULL;
free (u->format_hash_table[hash].key);
u->format_hash_table[hash].key = dtp->format;
u->format_hash_table[hash].key_len = dtp->format_len;
u->format_hash_table[hash].hashed_fmt = dtp->u.p.fmt;
}
static format_data *
find_parsed_format (st_parameter_dt *dtp)
{
uint32_t hash;
gfc_unit *u;
hash = format_hash (dtp);
u = dtp->u.p.current_unit;
if (u->format_hash_table[hash].key != NULL)
{
/* See if it matches. */
if (u->format_hash_table[hash].key_len == dtp->format_len)
{
/* So far so good. */
if (strncmp (u->format_hash_table[hash].key,
dtp->format, dtp->format_len) == 0)
return u->format_hash_table[hash].hashed_fmt;
}
}
return NULL;
}
/* next_char()-- Return the next character in the format string.
Returns -1 when the string is done. If the literal flag is set,
spaces are significant, otherwise they are not. */
static int
next_char (format_data *fmt, int literal)
{
int c;
do
{
if (fmt->format_string_len == 0)
return -1;
fmt->format_string_len--;
c = toupper (*fmt->format_string++);
fmt->error_element = c;
}
while ((c == ' ' || c == '\t') && !literal);
return c;
}
/* unget_char()-- Back up one character position. */
#define unget_char(fmt) \
{ fmt->format_string--; fmt->format_string_len++; }
/* get_fnode()-- Allocate a new format node, inserting it into the
current singly linked list. These are initially allocated from the
static buffer. */
static fnode *
get_fnode (format_data *fmt, fnode **head, fnode **tail, format_token t)
{
fnode *f;
if (fmt->avail == &fmt->last->array[FARRAY_SIZE])
{
fmt->last->next = xmalloc (sizeof (fnode_array));
fmt->last = fmt->last->next;
fmt->last->next = NULL;
fmt->avail = &fmt->last->array[0];
}
f = fmt->avail++;
memset (f, '\0', sizeof (fnode));
if (*head == NULL)
*head = *tail = f;
else
{
(*tail)->next = f;
*tail = f;
}
f->format = t;
f->repeat = -1;
f->source = fmt->format_string;
return f;
}
/* free_format()-- Free allocated format string. */
void
free_format (st_parameter_dt *dtp)
{
if ((dtp->common.flags & IOPARM_DT_HAS_FORMAT) && dtp->format)
{
free (dtp->format);
dtp->format = NULL;
}
}
/* free_format_data()-- Free all allocated format data. */
void
free_format_data (format_data *fmt)
{
fnode_array *fa, *fa_next;
fnode *fnp;
if (fmt == NULL)
return;
/* Free vlist descriptors in the fnode_array if one was allocated. */
for (fnp = fmt->array.array; fnp < &fmt->array.array[FARRAY_SIZE] &&
fnp->format != FMT_NONE; fnp++)
if (fnp->format == FMT_DT)
{
if (GFC_DESCRIPTOR_DATA(fnp->u.udf.vlist))
free (GFC_DESCRIPTOR_DATA(fnp->u.udf.vlist));
free (fnp->u.udf.vlist);
}
for (fa = fmt->array.next; fa; fa = fa_next)
{
fa_next = fa->next;
free (fa);
}
free (fmt);
fmt = NULL;
}
/* format_lex()-- Simple lexical analyzer for getting the next token
in a FORMAT string. We support a one-level token pushback in the
fmt->saved_token variable. */
static format_token
format_lex (format_data *fmt)
{
format_token token;
int negative_flag;
int c;
char delim;
if (fmt->saved_token != FMT_NONE)
{
token = fmt->saved_token;
fmt->saved_token = FMT_NONE;
return token;
}
negative_flag = 0;
c = next_char (fmt, 0);
switch (c)
{
case '*':
token = FMT_STAR;
break;
case '(':
token = FMT_LPAREN;
break;
case ')':
token = FMT_RPAREN;
break;
case '-':
negative_flag = 1;
/* Fall Through */
case '+':
c = next_char (fmt, 0);
if (!isdigit (c))
{
token = FMT_UNKNOWN;
break;
}
fmt->value = c - '0';
for (;;)
{
c = next_char (fmt, 0);
if (!isdigit (c))
break;
fmt->value = 10 * fmt->value + c - '0';
}
unget_char (fmt);
if (negative_flag)
fmt->value = -fmt->value;
token = FMT_SIGNED_INT;
break;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
fmt->value = c - '0';
for (;;)
{
c = next_char (fmt, 0);
if (!isdigit (c))
break;
fmt->value = 10 * fmt->value + c - '0';
}
unget_char (fmt);
token = (fmt->value == 0) ? FMT_ZERO : FMT_POSINT;
break;
case '.':
token = FMT_PERIOD;
break;
case ',':
token = FMT_COMMA;
break;
case ':':
token = FMT_COLON;
break;
case '/':
token = FMT_SLASH;
break;
case '$':
token = FMT_DOLLAR;
break;
case 'T':
switch (next_char (fmt, 0))
{
case 'L':
token = FMT_TL;
break;
case 'R':
token = FMT_TR;
break;
default:
token = FMT_T;
unget_char (fmt);
break;
}
break;
case 'X':
token = FMT_X;
break;
case 'S':
switch (next_char (fmt, 0))
{
case 'S':
token = FMT_SS;
break;
case 'P':
token = FMT_SP;
break;
default:
token = FMT_S;
unget_char (fmt);
break;
}
break;
case 'B':
switch (next_char (fmt, 0))
{
case 'N':
token = FMT_BN;
break;
case 'Z':
token = FMT_BZ;
break;
default:
token = FMT_B;
unget_char (fmt);
break;
}
break;
case '\'':
case '"':
delim = c;
fmt->string = fmt->format_string;
fmt->value = 0; /* This is the length of the string */
for (;;)
{
c = next_char (fmt, 1);
if (c == -1)
{
token = FMT_BADSTRING;
fmt->error = bad_string;
break;
}
if (c == delim)
{
c = next_char (fmt, 1);
if (c == -1)
{
token = FMT_BADSTRING;
fmt->error = bad_string;
break;
}
if (c != delim)
{
unget_char (fmt);
token = FMT_STRING;
break;
}
}
fmt->value++;
}
break;
case 'P':
token = FMT_P;
break;
case 'I':
token = FMT_I;
break;
case 'O':
token = FMT_O;
break;
case 'Z':
token = FMT_Z;
break;
case 'F':
token = FMT_F;
break;
case 'E':
switch (next_char (fmt, 0))
{
case 'N':
token = FMT_EN;
break;
case 'S':
token = FMT_ES;
break;
default:
token = FMT_E;
unget_char (fmt);
break;
}
break;
case 'G':
token = FMT_G;
break;
case 'H':
token = FMT_H;
break;
case 'L':
token = FMT_L;
break;
case 'A':
token = FMT_A;
break;
case 'D':
switch (next_char (fmt, 0))
{
case 'P':
token = FMT_DP;
break;
case 'C':
token = FMT_DC;
break;
case 'T':
token = FMT_DT;
break;
default:
token = FMT_D;
unget_char (fmt);
break;
}
break;
case 'R':
switch (next_char (fmt, 0))
{
case 'C':
token = FMT_RC;
break;
case 'D':
token = FMT_RD;
break;
case 'N':
token = FMT_RN;
break;
case 'P':
token = FMT_RP;
break;
case 'U':
token = FMT_RU;
break;
case 'Z':
token = FMT_RZ;
break;
default:
unget_char (fmt);
token = FMT_UNKNOWN;
break;
}
break;
case -1:
token = FMT_END;
break;
default:
token = FMT_UNKNOWN;
break;
}
return token;
}
/* parse_format_list()-- Parse a format list. Assumes that a left
paren has already been seen. Returns a list representing the
parenthesis node which contains the rest of the list. */
static fnode *
parse_format_list (st_parameter_dt *dtp, bool *seen_dd)
{
fnode *head, *tail;
format_token t, u, t2;
int repeat;
format_data *fmt = dtp->u.p.fmt;
bool seen_data_desc = false;
int standard;
head = tail = NULL;
/* Get the next format item */
format_item:
t = format_lex (fmt);
format_item_1:
switch (t)
{
case FMT_STAR:
t = format_lex (fmt);
if (t != FMT_LPAREN)
{
fmt->error = "Left parenthesis required after '*'";
goto finished;
}
get_fnode (fmt, &head, &tail, FMT_LPAREN);
tail->repeat = -2; /* Signifies unlimited format. */
tail->u.child = parse_format_list (dtp, &seen_data_desc);
*seen_dd = seen_data_desc;
if (fmt->error != NULL)
goto finished;
if (!seen_data_desc)
{
fmt->error = "'*' requires at least one associated data descriptor";
goto finished;
}
goto between_desc;
case FMT_POSINT:
repeat = fmt->value;
t = format_lex (fmt);
switch (t)
{
case FMT_LPAREN:
get_fnode (fmt, &head, &tail, FMT_LPAREN);
tail->repeat = repeat;
tail->u.child = parse_format_list (dtp, &seen_data_desc);
*seen_dd = seen_data_desc;
if (fmt->error != NULL)
goto finished;
goto between_desc;
case FMT_SLASH:
get_fnode (fmt, &head, &tail, FMT_SLASH);
tail->repeat = repeat;
goto optional_comma;
case FMT_X:
get_fnode (fmt, &head, &tail, FMT_X);
tail->repeat = 1;
tail->u.k = fmt->value;
goto between_desc;
case FMT_P:
goto p_descriptor;
default:
goto data_desc;
}
case FMT_LPAREN:
get_fnode (fmt, &head, &tail, FMT_LPAREN);
tail->repeat = 1;
tail->u.child = parse_format_list (dtp, &seen_data_desc);
*seen_dd = seen_data_desc;
if (fmt->error != NULL)
goto finished;
goto between_desc;
case FMT_SIGNED_INT: /* Signed integer can only precede a P format. */
case FMT_ZERO: /* Same for zero. */
t = format_lex (fmt);
if (t != FMT_P)
{
fmt->error = "Expected P edit descriptor in format";
goto finished;
}
p_descriptor:
get_fnode (fmt, &head, &tail, FMT_P);
tail->u.k = fmt->value;
tail->repeat = 1;
t = format_lex (fmt);
if (t == FMT_F || t == FMT_EN || t == FMT_ES || t == FMT_D
|| t == FMT_G || t == FMT_E)
{
repeat = 1;
goto data_desc;
}
if (t != FMT_COMMA && t != FMT_RPAREN && t != FMT_SLASH
&& t != FMT_POSINT)
{
fmt->error = "Comma required after P descriptor";
goto finished;
}
fmt->saved_token = t;
goto optional_comma;
case FMT_P: /* P and X require a prior number */
fmt->error = "P descriptor requires leading scale factor";
goto finished;
case FMT_X:
/*
EXTENSION!
If we would be pedantic in the library, we would have to reject
an X descriptor without an integer prefix:
fmt->error = "X descriptor requires leading space count";
goto finished;
However, this is an extension supported by many Fortran compilers,
including Cray, HP, AIX, and IRIX. Therefore, we allow it in the
runtime library, and make the front end reject it if the compiler
is in pedantic mode. The interpretation of 'X' is '1X'.
*/
get_fnode (fmt, &head, &tail, FMT_X);
tail->repeat = 1;
tail->u.k = 1;
goto between_desc;
case FMT_STRING:
get_fnode (fmt, &head, &tail, FMT_STRING);
tail->u.string.p = fmt->string;
tail->u.string.length = fmt->value;
tail->repeat = 1;
goto optional_comma;
case FMT_RC:
case FMT_RD:
case FMT_RN:
case FMT_RP:
case FMT_RU:
case FMT_RZ:
notify_std (&dtp->common, GFC_STD_F2003, "Fortran 2003: Round "
"descriptor not allowed");
get_fnode (fmt, &head, &tail, t);
tail->repeat = 1;
goto between_desc;
case FMT_DC:
case FMT_DP:
notify_std (&dtp->common, GFC_STD_F2003, "Fortran 2003: DC or DP "
"descriptor not allowed");
/* Fall through. */
case FMT_S:
case FMT_SS:
case FMT_SP:
case FMT_BN:
case FMT_BZ:
get_fnode (fmt, &head, &tail, t);
tail->repeat = 1;
goto between_desc;
case FMT_COLON:
get_fnode (fmt, &head, &tail, FMT_COLON);
tail->repeat = 1;
goto optional_comma;
case FMT_SLASH:
get_fnode (fmt, &head, &tail, FMT_SLASH);
tail->repeat = 1;
tail->u.r = 1;
goto optional_comma;
case FMT_DOLLAR:
get_fnode (fmt, &head, &tail, FMT_DOLLAR);
tail->repeat = 1;
notify_std (&dtp->common, GFC_STD_GNU, "Extension: $ descriptor");
goto between_desc;
case FMT_T:
case FMT_TL:
case FMT_TR:
t2 = format_lex (fmt);
if (t2 != FMT_POSINT)
{
fmt->error = posint_required;
goto finished;
}
get_fnode (fmt, &head, &tail, t);
tail->u.n = fmt->value;
tail->repeat = 1;
goto between_desc;
case FMT_I:
case FMT_B:
case FMT_O:
case FMT_Z:
case FMT_E:
case FMT_EN:
case FMT_ES:
case FMT_D:
case FMT_DT:
case FMT_L:
case FMT_A:
case FMT_F:
case FMT_G:
repeat = 1;
*seen_dd = true;
goto data_desc;
case FMT_H:
get_fnode (fmt, &head, &tail, FMT_STRING);
if (fmt->format_string_len < 1)
{
fmt->error = bad_hollerith;
goto finished;
}
tail->u.string.p = fmt->format_string;
tail->u.string.length = 1;
tail->repeat = 1;
fmt->format_string++;
fmt->format_string_len--;
goto between_desc;
case FMT_END:
fmt->error = unexpected_end;
goto finished;
case FMT_BADSTRING:
goto finished;
case FMT_RPAREN:
goto finished;
default:
fmt->error = unexpected_element;
goto finished;
}
/* In this state, t must currently be a data descriptor. Deal with
things that can/must follow the descriptor */
data_desc:
switch (t)
{
case FMT_L:
*seen_dd = true;
t = format_lex (fmt);
if (t != FMT_POSINT)
{
if (t == FMT_ZERO)
{
if (notification_std(GFC_STD_GNU) == NOTIFICATION_ERROR)
{
fmt->error = "Extension: Zero width after L descriptor";
goto finished;
}
else
notify_std (&dtp->common, GFC_STD_GNU,
"Zero width after L descriptor");
}
else
{
fmt->saved_token = t;
notify_std (&dtp->common, GFC_STD_GNU,
"Positive width required with L descriptor");
}
fmt->value = 1; /* Default width */
}
get_fnode (fmt, &head, &tail, FMT_L);
tail->u.n = fmt->value;
tail->repeat = repeat;
break;
case FMT_A:
*seen_dd = true;
t = format_lex (fmt);
if (t == FMT_ZERO)
{
fmt->error = zero_width;
goto finished;
}
if (t != FMT_POSINT)
{
fmt->saved_token = t;
fmt->value = -1; /* Width not present */
}
get_fnode (fmt, &head, &tail, FMT_A);
tail->repeat = repeat;
tail->u.n = fmt->value;
break;
case FMT_D:
case FMT_E:
case FMT_F:
case FMT_G:
case FMT_EN:
case FMT_ES:
*seen_dd = true;
get_fnode (fmt, &head, &tail, t);
tail->repeat = repeat;
u = format_lex (fmt);
/* Processing for zero width formats. */
if (u == FMT_ZERO)
{
if (t == FMT_F)
standard = GFC_STD_F95;
else if (t == FMT_G)
standard = GFC_STD_F2008;
else
standard = GFC_STD_F2018;
if (notification_std (standard) == NOTIFICATION_ERROR
|| dtp->u.p.mode == READING)
{
fmt->error = zero_width;
goto finished;
}
tail->u.real.w = 0;
/* Look for the dot seperator. */
u = format_lex (fmt);
if (u != FMT_PERIOD)
{
fmt->saved_token = u;
break;
}
/* Look for the precision. */
u = format_lex (fmt);
if (u != FMT_ZERO && u != FMT_POSINT)
{
fmt->error = nonneg_required;
goto finished;
}
tail->u.real.d = fmt->value;
/* Look for optional exponent, not allowed for FMT_D */
if (t == FMT_D)
break;
u = format_lex (fmt);
if (u != FMT_E)
fmt->saved_token = u;
else
{
u = format_lex (fmt);
if (u != FMT_POSINT)
{
if (u == FMT_ZERO)
{
notify_std (&dtp->common, GFC_STD_F2018,
"Positive exponent width required");
}
else
{
fmt->error = "Positive exponent width required in "
"format string at %L";
goto finished;
}
}
tail->u.real.e = fmt->value;
}
break;
}
/* Processing for positive width formats. */
if (u == FMT_POSINT)
{
tail->u.real.w = fmt->value;
/* Look for the dot separator. Because of legacy behaviors
we do some look ahead for missing things. */
t2 = t;