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/* mpc_inp_str -- Input a complex number from a given stream.
Copyright (C) 2009 Andreas Enge, Philippe Th\'eveny, Paul Zimmermann
This file is part of the MPC Library.
The MPC Library is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or (at your
option) any later version.
The MPC Library 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 Lesser General Public
License for more details.
You should have received a copy of the GNU Lesser General Public License
along with the MPC Library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
MA 02111-1307, USA. */
#include <stdio.h> /* for FILE */
#include <ctype.h>
#include <string.h>
#include "mpc-impl.h"
static size_t
skip_whitespace (FILE *stream) {
int c = getc (stream);
size_t size = 0;
while (c != EOF && isspace ((unsigned char) c)) {
c = getc (stream);
size++;
}
if (c != EOF)
ungetc (c, stream);
return size;
}
/* Extract from stream the longest string made up of alphanumeric char and
'_' (i.e. n-char-sequence).
The user must free the returned string. */
static char *
extract_suffix (FILE *stream)
{
int c;
size_t nread = 0;
size_t strsize = 100;
char *str = mpc_alloc_str (strsize);
c = getc (stream);
while (isalnum ((unsigned char) c) || c == '_') {
str [nread] = (char) c;
nread++;
if (nread == strsize) {
str = mpc_realloc_str (str, strsize, 2 * strsize);
strsize *= 2;
}
c = getc (stream);
}
str = mpc_realloc_str (str, strsize, nread + 1);
strsize = nread + 1;
str [nread] = '\0';
if (c != EOF)
ungetc (c, stream);
return str;
}
/* Extract from the stream the longest string of characters which are neither
whitespace nor brackets (except for an optional bracketed n-char_sequence
directly following nan or @nan@ independently of case).
The user must free the returned string. */
static char *
extract_string (FILE *stream)
{
int c;
size_t nread = 0;
size_t strsize = 100;
char *str = mpc_alloc_str (strsize);
size_t lenstr;
c = getc (stream);
while (c != EOF && c != '\n'
&& !isspace ((unsigned char) c)
&& c != '(' && c != ')') {
str [nread] = (char) c;
nread++;
if (nread == strsize) {
str = mpc_realloc_str (str, strsize, 2 * strsize);
strsize *= 2;
}
c = getc (stream);
}
str = mpc_realloc_str (str, strsize, nread + 1);
strsize = nread + 1;
str [nread] = '\0';
if (nread == 0)
return str;
lenstr = nread;
if (c == '(') {
size_t n;
char *suffix;
/* (n-char-sequence) only after a NaN */
if ((nread != 3
|| tolower (str[0]) != 'n'
|| tolower (str[1]) != 'a'
|| tolower (str[2]) != 'n')
&& (nread != 5
|| str[0] != '@'
|| tolower (str[1]) != 'n'
|| tolower (str[2]) != 'a'
|| tolower (str[3]) != 'n'
|| str[4] != '@')) {
ungetc (c, stream);
return str;
}
suffix = extract_suffix (stream);
nread += strlen (suffix) + 1;
if (nread >= strsize) {
str = mpc_realloc_str (str, strsize, nread + 1);
strsize = nread + 1;
}
/* Warning: the sprintf does not allow overlap between arguments. */
n = lenstr + sprintf (str + lenstr, "(%s", suffix);
MPC_ASSERT (n == nread);
c = getc (stream);
if (c == ')') {
str = mpc_realloc_str (str, strsize, nread + 2);
strsize = nread + 2;
str [nread] = c;
str [nread+1] = '\0';
nread++;
}
else if (c != EOF)
ungetc (c, stream);
mpc_free_str (suffix);
}
else if (c != EOF)
ungetc (c, stream);
return str;
}
int
mpc_inp_str (mpc_ptr rop, FILE *stream, size_t *read, int base,
mpc_rnd_t rnd_mode)
{
size_t white, nread = 0;
int inex = -1;
int c;
char *str;
if (stream == NULL)
stream = stdin;
white = skip_whitespace (stream);
c = getc (stream);
if (c != EOF) {
if (c == '(') {
char *real_str;
char *imag_str;
size_t n;
nread++; /* the opening parenthesis */
white = skip_whitespace (stream);
real_str = extract_string (stream);
nread += strlen(real_str);
c = getc (stream);
if (!isspace ((unsigned int) c)) {
if (c != EOF)
ungetc (c, stream);
mpc_free_str (real_str);
goto error;
}
else
ungetc (c, stream);
white += skip_whitespace (stream);
imag_str = extract_string (stream);
nread += strlen (imag_str);
str = mpc_alloc_str (nread + 2);
n = sprintf (str, "(%s %s", real_str, imag_str);
MPC_ASSERT (n == nread + 1);
mpc_free_str (real_str);
mpc_free_str (imag_str);
white += skip_whitespace (stream);
c = getc (stream);
if (c == ')') {
str = mpc_realloc_str (str, nread +2, nread + 3);
str [nread+1] = c;
str [nread+2] = '\0';
nread++;
}
else if (c != EOF)
ungetc (c, stream);
}
else {
if (c != EOF)
ungetc (c, stream);
str = extract_string (stream);
nread += strlen (str);
}
inex = mpc_set_str (rop, str, base, rnd_mode);
mpc_free_str (str);
}
error:
if (inex == -1) {
mpfr_set_nan (MPC_RE(rop));
mpfr_set_nan (MPC_IM(rop));
}
if (read != NULL)
*read = white + nread;
return inex;
}
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