gnuplot/src/datablock.c at 5.4.8 · gnuplot/gnuplot · GitHub

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/* GNUPLOT - datablock.c */

/*[

* Copyright Ethan A Merritt 2012

* Gnuplot license:

* Permission to use, copy, and distribute this software and its

* documentation for any purpose with or without fee is hereby granted,

* provided that the above copyright notice appear in all copies and

* that both that copyright notice and this permission notice appear

* in supporting documentation.

* Permission to modify the software is granted, but not the right to

* distribute the complete modified source code. Modifications are to

* be distributed as patches to the released version. Permission to

* distribute binaries produced by compiling modified sources is granted,

* provided you

* 1. distribute the corresponding source modifications from the

* released version in the form of a patch file along with the binaries,

* 2. add special version identification to distinguish your version

* in addition to the base release version number,

* 3. provide your name and address as the primary contact for the

* support of your modified version, and

* 4. retain our contact information in regard to use of the base

* software.

* Permission to distribute the released version of the source code along

* with corresponding source modifications in the form of a patch file is

* granted with same provisions 2 through 4 for binary distributions.

* This software is provided "as is" without express or implied warranty

* to the extent permitted by applicable law.

* Alternative license:

* As an alternative to distributing code in this file under the gnuplot license,

* you may instead comply with the terms below. In this case, redistribution and

* use in source and binary forms, with or without modification, are permitted

* provided that the following conditions are met:

* Redistributions of source code must retain the above copyright notice, this

* list of conditions and the following disclaimer. Redistributions in binary

* form must reproduce the above copyright notice, this list of conditions and

* the following disclaimer in the documentation and/or other materials provided

* with the distribution.

* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE

* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

* POSSIBILITY OF SUCH DAMAGE.

]*/

#include "gp_types.h"

#include "alloc.h"

#include "command.h"

#include "datablock.h"

#include "datafile.h"

#include "eval.h"

#include "misc.h"

#include "util.h"

static int enlarge_datablock(struct value *datablock_value, int extra);

* In-line data blocks are implemented as a here-document:

* $FOO << EOD

* data line 1

* data line 2

* ...

* EOD

* The data block name must begin with $ followed by a letter.

* The string EOD is arbitrary; lines of data will be read from the input stream

* until the leading characters on the line match the given character string.

* No attempt is made to parse the data at the time it is read in.

void

datablock_command()

{

FILE *fin;

char *name, *eod;

int nlines;

int nsize = 4;

struct udvt_entry *datablock;

char *dataline = NULL;

if (!isletter(c_token+1))

int_error(c_token, "illegal datablock name");

/* Create or recycle a datablock with the requested name */

name = parse_datablock_name();

datablock = add_udv_by_name(name);

if (!equals(c_token, "<<") || !isletter(c_token+1))

int_error(c_token, "data block name must be followed by << EODmarker");

if (datablock->udv_value.type != NOTDEFINED)

gpfree_datablock(&datablock->udv_value);

datablock->udv_value.type = DATABLOCK;

datablock->udv_value.v.data_array = NULL;

c_token++;

eod = (char *) gp_alloc(token[c_token].length +2, "datablock");

copy_str(&eod[0], c_token, token[c_token].length + 2);

c_token++;

/* Read in and store data lines until EOD */

fin = (lf_head == NULL) ? stdin : lf_head->fp;

if (!fin)

int_error(NO_CARET,"attempt to define data block from invalid context");

for (nlines = 0; (dataline = df_fgets(fin)); nlines++) {

int n;

if (!strncmp(eod, dataline, strlen(eod)))

break;

/* Allocate space for data lines plus at least 2 empty lines at the end. */

if (nlines >= nsize-4) {

nsize *= 2;

datablock->udv_value.v.data_array =

(char **) gp_realloc(datablock->udv_value.v.data_array,

nsize * sizeof(char *), "datablock");

memset(&datablock->udv_value.v.data_array[nlines], 0,

(nsize - nlines) * sizeof(char *));

}

/* Strip trailing newline character */

n = strlen(dataline);

if (n > 0 && dataline[n - 1] == '\n')

dataline[n - 1] = NUL;

datablock->udv_value.v.data_array[nlines] = gp_strdup(dataline);

}

inline_num += nlines + 1; /* Update position in input file */

/* make sure that we can safely add lines to this datablock later on */

enlarge_datablock(&datablock->udv_value, 0);

free(eod);

return;

}

char *

parse_datablock_name()

{

/* Datablock names begin with $, but the scanner puts */

/* the $ in a separate token. Merge it with the next. */

/* Caller must _not_ free the string that is returned. */

static char *name = NULL;

free(name);

c_token++;

name = (char *) gp_alloc(token[c_token].length + 2, "datablock");

name[0] = '$';

copy_str(&name[1], c_token, token[c_token].length + 2);

c_token++;

return name;

}

char **

get_datablock(char *name)

{

struct udvt_entry *datablock;

datablock = get_udv_by_name(name);

if (!datablock || datablock->udv_value.type != DATABLOCK

|| datablock->udv_value.v.data_array == NULL)

int_error(NO_CARET,"no datablock named %s",name);

return datablock->udv_value.v.data_array;

}

void

gpfree_datablock(struct value *datablock_value)

{

int i;

char **stored_data = datablock_value->v.data_array;

if (datablock_value->type != DATABLOCK)

return;

if (stored_data)

for (i=0; stored_data[i] != NULL; i++)

free(stored_data[i]);

free(stored_data);

datablock_value->v.data_array = NULL;

datablock_value->type = NOTDEFINED;

}

/* count number of lines in a datablock */

int

datablock_size(struct value *datablock_value)

{

char **dataline;

int nlines = 0;

dataline = datablock_value->v.data_array;

if (dataline) {

while (*dataline++)

nlines++;

}

return nlines;

}

/* resize or allocate a datablock; allocate memory in chunks */

static int

enlarge_datablock(struct value *datablock_value, int extra)

{

int osize, nsize;

const int blocksize = 512;

int nlines = datablock_size(datablock_value);

/* reserve space in multiples of blocksize */

osize = ((nlines+1 + blocksize-1) / blocksize) * blocksize;

nsize = ((nlines+1 + extra + blocksize-1) / blocksize) * blocksize;

/* only resize if necessary */

if ((osize != nsize) || (extra == 0) || (nlines == 0)) {

datablock_value->v.data_array =

(char **) gp_realloc(datablock_value->v.data_array, nsize * sizeof(char *), "resize_datablock");

datablock_value->v.data_array[nlines] = NULL;

}

return nlines;

}

/* append a single line to a datablock */

void

append_to_datablock(struct value *datablock_value, const char *line)

{

int nlines = enlarge_datablock(datablock_value, 1);

datablock_value->v.data_array[nlines] = (char *) line;

datablock_value->v.data_array[nlines + 1] = NULL;

}

/* append multiple lines which are separated by linebreaks to a datablock */

void

append_multiline_to_datablock(struct value *datablock_value, const char *lines)

{

char * l = (char *) lines;

char * p;

TBOOLEAN inquote = FALSE;

TBOOLEAN escaped = FALSE;

/* handle lines with line-breaks, one at a time;

take care of quoted strings

p = l;

while (*p != NUL) {

if (*p == '\'' && !escaped)

inquote = !inquote;

else if (*p == '\\' && !escaped)

escaped = TRUE;

else if (*p == '\n' && !inquote) {

*p = NUL;

append_to_datablock(datablock_value, strdup(l));

l = p + 1;

} else

escaped = FALSE;

p++;

}

if (l == lines) {

/* no line-breaks, just a single line */

append_to_datablock(datablock_value, l);

} else {

if (strlen(l) > 0) /* remainder after last line-break */

append_to_datablock(datablock_value, strdup(l));

/* we allocated new sub-strings, free the original */

free((char *) lines);

}

gnuplot/src/datablock.c at 5.4.8 · gnuplot/gnuplot · GitHub

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