gnuplot-old/src/datafile.c at axis_branch_base · gnuplot/gnuplot-old · GitHub

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#ifndef lint

static char *RCSid() { return RCSid("$Id: datafile.c,v 1.18.2.4 2000/07/26 18:52:58 broeker Exp $"); }

#endif

/* GNUPLOT - datafile.c */

/*[

* 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.

]*/

/* AUTHOR : David Denholm */

* this file provides the functions to handle data-file reading..

* takes care of all the pipe / stdin / index / using worries

/*{{{ notes */

/* couldn't decide how to implement 'thru' only for 2d and 'index'

* for only 3d, so I did them for both - I can see a use for

* index in 2d, especially for fit.

* I keep thru for backwards compatibility, and extend it to allow

* more natural plot 'data' thru f(y) - I (personally) prefer

* my syntax, but then I'm biased...

* - because I needed it, I have added a range of indexes...

* (s)plot 'data' [index i[:j]]

* also every a:b:c:d:e:f - plot every a'th point from c to e,

* in every b lines from d to f

* ie for (line=d; line<=f; line+=b)

* for (point=c; point >=e; point+=a)

* I dont like mixing this with the time series hack... I am

* very into modular code, so I would prefer to not have to

* have _anything_ to do with time series... for example,

* we just look at columns in file, and that is independent

* of 2d/3d. I really dont want to have to pass a flag to

* this is plot or splot.

* use a global array df_timecol[] - cleared by df_open, then

* columns needing time set by client.

* Now that df_2dbinary() and df_3dbinary() are here, I am seriously

* tempted to move get_data() and get_3ddata() in here too

* public variables declared in this file.

* int df_no_use_specs - number of columns specified with 'using'

* int df_line_number - for error reporting

* int df_datum - increases with each data point

* TBOOLEAN df_binary - it's a binary file

* [ might change this to return value from df_open() ]

* int df_eof - end of file

* int df_timecol[] - client controls which cols read as time

* functions

* int df_open(int max_using)

* parses thru / index / using on command line

* max_using is max no of 'using' columns allowed

* returns number of 'using' cols specified, or -1 on error (?)

* int df_readline(double vector[], int max)

* reads a line, does all the 'index' and 'using' manipulation

* deposits values into vector[]

* returns

* number of columns parsed [0=not blank line, but no valid data],

* DF_EOF for EOF

* DF_UNDEFINED - undefined result during eval of extended using spec

* DF_FIRST_BLANK for first consecutive blank line

* DF_SECOND_BLANK for second consecutive blank line

* will return FIRST before SECOND

* if a using spec was given, lines not fulfilling spec are ignored.

* we will always return exactly the number of items specified

* if no spec given, we return number of consecutive columns we parsed.

* if we are processing indexes, separated by 'n' blank lines,

* we will return n-1 blank lines before noticing the index change

* void df_close()

* closes a currently open file.

* void f_dollars(x)

* void f_column() actions for expressions using $i, column(j), etc

* void f_valid()

* line parsing slightly differently from previous versions of gnuplot...

* given a line containing fewer columns than asked for, gnuplot used to make

* up values... I say that if I have explicitly said 'using 1:2:3', then if

* column 3 doesn't exist, I dont want this point...

* a column number of 0 means generate a value... as before, this value

* is useful in 2d as an x value, and is reset at blank lines.

* a column number of -1 means the (data) line number (not the file line

* number). splot 'file' using 1 is equivalent to

* splot 'file' using 0:-1:1

* column number -2 is the index. It was put in to kludge multi-branch

* fitting.

* 20/5/95 : accept 1.23d4 in place of e (but not in scanf string)

* : autoextend data line buffer and MAX_COLS

* 11/8/96 : add 'columns' -1 for suggested y value, and -2 for

* current index.

* using 1:-1:-2 and column(-1) are supported.

* $-1 and $-2 are not yet supported, because of the

* way the parser works

/*}}} */

#include "datafile.h"

#include "alloc.h"

#include "axis.h"

#include "command.h"

#include "binary.h"

#include "gp_time.h"

#include "graphics.h"

#include "internal.h"

#include "misc.h"

#include "parse.h"

#include "plot.h"

/* #include "setshow.h" */

#include "util.h"

/* if you change this, change the scanf in readline */

#define NCOL 7 /* max using specs */

/* test to see if the end of an inline datafile is reached */

#define is_EOF(c) ((c) == 'e' || (c) == 'E')

/*{{{ static fns */

#if 0 /* not used */

static int get_time_cols __PROTO((char *fmt));

static void mod_def_usespec __PROTO((int specno, int jump));

#endif

static int check_missing __PROTO((char *s));

static char *df_gets __PROTO((void));

static int df_tokenise __PROTO((char *s));

static float **df_read_matrix __PROTO((int *rows, int *columns));

static void plot_option_every __PROTO((void));

static void plot_option_index __PROTO((void));

static void plot_option_thru __PROTO((void));

static void plot_option_using __PROTO((int));

static TBOOLEAN valid_format __PROTO((const char *));

/*}}} */

/*{{{ variables */

struct use_spec_s {

int column;

struct at_type *at;

};

/* public variables client might access */

int df_no_use_specs; /* how many using columns were specified */

int df_line_number;

int df_datum; /* suggested x value if none given */

TBOOLEAN df_matrix = FALSE; /* is this a matrix splot */

int df_eof = 0;

AXIS_INDEX df_axis[NCOL];

TBOOLEAN df_binary = FALSE; /* this is a binary file */

/* jev -- the 'thru' function --- NULL means no dummy vars active */

/* HBB 990829: moved this here, from command.c */

struct udft_entry ydata_func;

/* string representing missing values in ascii datafiles */

char *missing_val = NULL;

/* If any 'inline data' are in use for the current plot, flag this */

TBOOLEAN plotted_data_from_stdin = FALSE;

/* private variables */

/* in order to allow arbitrary data line length, we need to use the heap

* might consider free-ing it in df_close, especially for small systems

static char *line = NULL;

static size_t max_line_len = 0;

#define DATA_LINE_BUFSIZ 160

static FILE *data_fp = NULL;

static TBOOLEAN df_pipe_open = FALSE;

static TBOOLEAN mixed_data_fp = FALSE;

#ifndef MAXINT /* should there be one already defined ? */

# ifdef INT_MAX /* in limits.h ? */

# define MAXINT INT_MAX

# else

# define MAXINT ((~0)>>1)

# endif

#endif

/* stuff for implementing index */

static int blank_count = 0; /* how many blank lines recently */

static int df_lower_index = 0; /* first mesh required */

static int df_upper_index = MAXINT;

static int df_index_step = 1; /* 'every' for indices */

static int df_current_index; /* current mesh */

/* stuff for every point:line */

static int everypoint = 1;

static int firstpoint = 0;

static int lastpoint = MAXINT;

static int everyline = 1;

static int firstline = 0;

static int lastline = MAXINT;

static int point_count = -1; /* point counter - preincrement and test 0 */

static int line_count = 0; /* line counter */

/* parsing stuff */

static struct use_spec_s use_spec[NCOL];

static char df_format[MAX_LINE_LEN + 1];

/* rather than three arrays which all grow dynamically, make one

* dynamic array of this structure

typedef struct df_column_struct {

double datum;

enum {

DF_MISSING, DF_BAD, DF_GOOD

} good;

char *position;

} df_column_struct;

static df_column_struct *df_column = NULL; /* we'll allocate space as needed */

static int df_max_cols = 0; /* space allocated */

static int df_no_cols; /* cols read */

static int fast_columns; /* corey@cac optimization */

/* columns needing timefmt are passed in df_timecol[] after df_open */

/*}}} */

/*{{{ static char *df_gets() */

static char *

df_gets()

{

int len = 0;

/* HBB 20000526: prompt user for inline data, if in interactive mode */

if (mixed_data_fp && interactive)

fputs("input data ('e' ends) > ", stderr);

if (!fgets(line, max_line_len, data_fp))

return NULL;

if (mixed_data_fp)

++inline_num;

for (;;) {

len += strlen(line + len);

if (len > 0 && line[len - 1] == '\n') {

/* we have read an entire text-file line.

* Strip the trailing linefeed and return

line[len - 1] = 0;

return line;

}

/* buffer we provided may not be full - dont grab extra

* memory un-necessarily. This may trap a problem with last

* line in file not being properly terminated - each time

* through a replot loop, it was doubling buffer size

if ((max_line_len - len) < 32)

line = gp_realloc(line, max_line_len *= 2, "datafile line buffer");

if (!fgets(line + len, max_line_len - len, data_fp))

return line; /* unexpected end of file, but we have something to do */

}

/* NOTREACHED */

return NULL;

}

/*}}} */

/*{{{ static int df_tokenise(s) */

static int

df_tokenise(s)

char *s;

{

/* implement our own sscanf that takes 'missing' into account,

* and can understand fortran quad format

df_no_cols = 0;

while (*s) {

/* check store - double max cols or add 20, whichever is greater */

if (df_max_cols <= df_no_cols)

df_column = (df_column_struct *) gp_realloc(df_column,

(df_max_cols += (df_max_cols < 20 ? 20 : df_max_cols)) * sizeof(df_column_struct),

"datafile column");

/* have always skipped spaces at this point */

df_column[df_no_cols].position = s;

if (check_missing(s))

df_column[df_no_cols].good = DF_MISSING;

else {

#ifdef OSK

/* apparently %n does not work. This implementation

* is just as good as the non-OSK one, but close

* to a release (at last) we make it os-9 specific

int count;

char *p = strpbrk(s, "dqDQ");

if (p != NULL)

*p = 'e';

count = sscanf(s, "%lf", &df_column[df_no_cols].datum);

#else

/* cannot trust strtod - eg strtod("-",&p) */

int used;

int count;

int dfncp1 = df_no_cols + 1;

* optimizations by Corey Satten, corey@cac.washington.edu

if ((fast_columns == 0)

|| (df_no_use_specs == 0)

|| ((df_no_use_specs > 0)

&& (use_spec[0].column == dfncp1

|| (df_no_use_specs > 1

&& (use_spec[1].column == dfncp1

|| (df_no_use_specs > 2

&& (use_spec[2].column == dfncp1

|| (df_no_use_specs > 3

&& (use_spec[3].column == dfncp1

|| (df_no_use_specs > 4 && (use_spec[4].column == dfncp1 || df_no_use_specs > 5)

)

) {

#ifndef NO_FORTRAN_NUMS

count = sscanf(s, "%lf%n", &df_column[df_no_cols].datum, &used);

#else

while (isspace(*s))

++s;

count = *s ? 1 : 0;

df_column[df_no_cols].datum = atof(s);

#endif /* NO_FORTRAN_NUMS */

} else {

/* skip any space at start of column */

/* HBB tells me that the cast must be to

* unsigned char instead of int. */

while (isspace((unsigned char) *s))

++s;

count = *s ? 1 : 0;

/* skip chars to end of column */

used = 0;

while (!isspace((unsigned char) *s) && (*s != NUL))

++s;

}

/* it might be a fortran double or quad precision.

* 'used' is only safe if count is 1

#ifndef NO_FORTRAN_NUMS

if (count == 1 &&

(s[used] == 'd' || s[used] == 'D' ||

s[used] == 'q' || s[used] == 'Q')) {

/* might be fortran double */

s[used] = 'e';

/* and try again */

count = sscanf(s, "%lf", &df_column[df_no_cols].datum);

}

#endif /* NO_FORTRAN_NUMS */

#endif /* OSK */

df_column[df_no_cols].good = count == 1 ? DF_GOOD : DF_BAD;

}

++df_no_cols;

/*{{{ skip chars to end of column */

while ((!isspace((int) *s)) && (*s != '\0'))

++s;

/*}}} */

/*{{{ skip spaces to start of next column */

while (isspace((int) *s))

++s;

/*}}} */

}

return df_no_cols;

}

/*}}} */

/*{{{ static float **df_read_matrix() */

/* reads a matrix from a text file

* stores in same storage format as fread_matrix

static float **

df_read_matrix(rows, cols)

int *rows, *cols;

{

int max_rows = 0;

int c;

float **rmatrix = NULL;

char *s;

*rows = 0;

*cols = 0;

for (;;) {

if (!(s = df_gets())) {

df_eof = 1;

return rmatrix; /* NULL if we have not read anything yet */

}

while (isspace((int) *s))

++s;

if (!*s || is_comment(*s)) {

if (rmatrix)

return rmatrix;

else

continue;

}

if (mixed_data_fp && is_EOF(*s)) {

df_eof = 1;

return rmatrix;

}

c = df_tokenise(s);

if (!c)

return rmatrix;

if (*cols && c != *cols) {

/* its not regular */

int_error(NO_CARET, "Matrix does not represent a grid");

}

*cols = c;

if (*rows >= max_rows) {

rmatrix = gp_realloc(rmatrix, (max_rows += 10) * sizeof(float *), "df_matrix");

}

/* allocate a row and store data */

{

int i;

float *row = rmatrix[*rows] = (float *) gp_alloc(c * sizeof(float),

"df_matrix row");

for (i = 0; i < c; ++i) {

if (df_column[i].good != DF_GOOD)

int_error(NO_CARET, "Bad number in matrix");

row[i] = (float) df_column[i].datum;

}

++*rows;

}

/*}}} */

/*{{{ int df_open(max_using) */

int

df_open(max_using)

int max_using;

/* open file, parsing using/thru/index stuff

* return number of using specs [well, we have to return something !]

{

/* now allocated dynamically */

static char *filename = NULL;

int i;

int name_token;

fast_columns = 1; /* corey@cac */

/*{{{ close file if necessary */

if (data_fp)

df_close();

/*}}} */

/*{{{ initialise static variables */

df_format[0] = NUL; /* no format string */

df_no_use_specs = 0;

for (i = 0; i < NCOL; ++i) {

use_spec[i].column = i + 1; /* default column */

use_spec[i].at = NULL; /* no expression */

df_axis[i] = -1; /* no timefmt for this output column */

}

if (max_using > NCOL)

max_using = NCOL;

df_datum = -1; /* it will be preincremented before use */

df_line_number = 0; /* ditto */

df_lower_index = 0;

df_index_step = 1;

df_upper_index = MAXINT;

df_current_index = 0;

blank_count = 2;

/* by initialising blank_count, leading blanks will be ignored */

everypoint = everyline = 1; /* unless there is an every spec */

firstpoint = firstline = 0;

lastpoint = lastline = MAXINT;

df_eof = 0;

df_binary = 1;

/*}}} */

assert(max_using <= NCOL);

/* empty name means re-use last one */

if (isstring(c_token) && token_len(c_token) == 2) {

if (!filename || !*filename)

int_error(c_token, "No previous filename");

} else {

filename = gp_realloc(filename, token_len(c_token), "datafile name");

quote_str(filename, c_token, token_len(c_token));

}

name_token = c_token++;

/* defer opening until we have parsed the modifiers... */

/*{{{ look for binary / matrix */

df_binary = df_matrix = FALSE;

if (almost_equals(c_token, "bin$ary")) {

++c_token;

df_binary = TRUE;

df_matrix = TRUE;

} else if (almost_equals(c_token, "mat$rix")) {

++c_token;

df_matrix = TRUE;

}

/*}}} */

/*{{{ deal with index */

if (almost_equals(c_token, "i$ndex")) {

plot_option_index();

}

/*}}} */

/*{{{ deal with every */

if (almost_equals(c_token, "ev$ery")) {

plot_option_every();

}

/*}}} */

/*{{{ deal with thru */

/* jev -- support for passing data from file thru user function */

if (ydata_func.at)

free(ydata_func.at);

ydata_func.at = NULL;

if (almost_equals(c_token, "thru$")) {

plot_option_thru();

}

/*}}} */

/*{{{ deal with using */

if (almost_equals(c_token, "u$sing")) {

plot_option_using(max_using);

}

/*}}} */

/*{{{ more variable inits */

point_count = -1; /* we preincrement */

line_count = 0;

/* here so it's not done for every line in df_readline */

if (max_line_len < DATA_LINE_BUFSIZ) {

max_line_len = DATA_LINE_BUFSIZ;

line = (char *) gp_alloc(max_line_len, "datafile line buffer");

}

/*}}} */

/* filename cannot be static array! */

gp_expand_tilde(&filename);

/*{{{ open file */

#if defined(PIPES)

if (*filename == '<') {

if ((data_fp = popen(filename + 1, "r")) == (FILE *) NULL)

os_error(name_token, "cannot create pipe for data");

else

df_pipe_open = TRUE;

} else

#endif /* PIPES */

/* I don't want to call strcmp(). Does it make a difference? */

if (*filename == '-' && strlen(filename) == 1) {

plotted_data_from_stdin = TRUE;

data_fp = lf_top();

if (!data_fp)

data_fp = stdin;

mixed_data_fp = TRUE; /* don't close command file */

} else {

#ifdef HAVE_SYS_STAT_H

struct stat statbuf;

if ((stat(filename, &statbuf) > -1) &&

!S_ISREG(statbuf.st_mode) && !S_ISFIFO(statbuf.st_mode)) {

os_error(name_token, "\"%s\" is not a regular file or pipe", filename);

}

#endif /* HAVE_SYS_STAT_H */

if ((data_fp = loadpath_fopen(filename, df_binary ? "rb" : "r")) == (FILE *) NULL) {

os_error(name_token, "can't read data file \"%s\"", filename);

}

/*}}} */

return df_no_use_specs;

}

/*}}} */

/*{{{ void df_close() */

void

df_close()

{

int i;

/* paranoid - mark $n and column(n) as invalid */

df_no_cols = 0;

if (!data_fp)

return;

if (ydata_func.at) {

free(ydata_func.at);

ydata_func.at = NULL;

}

/*{{{ free any use expression storage */

for (i = 0; i < df_no_use_specs; ++i)

if (use_spec[i].at) {

free(use_spec[i].at);

use_spec[i].at = NULL;

}

/*}}} */

if (!mixed_data_fp) {

#if defined(PIPES)

if (df_pipe_open) {

(void) pclose(data_fp);

df_pipe_open = FALSE;

} else

#endif /* PIPES */

(void) fclose(data_fp);

}

mixed_data_fp = FALSE;

data_fp = NULL;

}

/*}}} */

static void

plot_option_every()

{

struct value a;

fast_columns = 0; /* corey@cac */

/* allow empty fields - every a:b:c::e

* we have already established the defaults

if (!equals(++c_token, ":")) {

everypoint = (int) real(const_express(&a));

if (everypoint < 1)

int_error(c_token, "Expected positive integer");

}

/* if it fails on first test, no more tests will succeed. If it

* fails on second test, next test will succeed with correct c_token

if (equals(c_token, ":") && !equals(++c_token, ":")) {

everyline = (int) real(const_express(&a));

if (everyline < 1)

int_error(c_token, "Expected positive integer");

}

if (equals(c_token, ":") && !equals(++c_token, ":")) {

firstpoint = (int) real(const_express(&a));

if (firstpoint < 0)

int_error(c_token, "Expected non-negative integer");

}

if (equals(c_token, ":") && !equals(++c_token, ":")) {

firstline = (int) real(const_express(&a));

if (firstline < 0)

int_error(c_token, "Expected non-negative integer");

}

if (equals(c_token, ":") && !equals(++c_token, ":")) {

lastpoint = (int) real(const_express(&a));

if (lastpoint < firstpoint)

int_error(c_token, "Last point must not be before first point");

}

if (equals(c_token, ":")) {

++c_token;

lastline = (int) real(const_express(&a));

if (lastline < firstline)

int_error(c_token, "Last line must not be before first line");

}

static void

plot_option_index()

{

struct value a;

if (df_binary)

int_error(c_token, "Binary file format does not allow more than one surface per file");

++c_token;

df_lower_index = (int) real(const_express(&a));

if (equals(c_token, ":")) {

++c_token;

df_upper_index = (int) magnitude(const_express(&a));

if (df_upper_index < df_lower_index)

int_error(c_token, "Upper index should be bigger than lower index");

if (equals(c_token, ":")) {

++c_token;

df_index_step = (int) magnitude(const_express(&a));

if (df_index_step < 1)

int_error(c_token, "Index step must be positive");

}

} else

df_upper_index = df_lower_index;

}

static void

plot_option_thru()

{

c_token++;

strcpy(c_dummy_var[0], set_dummy_var[0]);

/* allow y also as a dummy variable.

* during plot, c_dummy_var[0] and [1] are 'sacred'

* ie may be set by splot [u=1:2] [v=1:2], and these

* names are stored only in c_dummy_var[]

* so choose dummy var 2 - can anything vital be here ?

dummy_func = &ydata_func;

strcpy(c_dummy_var[2], "y");

ydata_func.at = perm_at();

dummy_func = NULL;

}

static void

plot_option_using(max_using)

int max_using;

{

if (!END_OF_COMMAND && !isstring(++c_token)) {

struct value a;

do { /* must be at least one */

if (df_no_use_specs >= max_using)

int_error(c_token, "Too many columns in using specification");

if (equals(c_token, ":")) {

/* empty specification - use default */

use_spec[df_no_use_specs].column = df_no_use_specs;

++df_no_use_specs;

/* do not increment c+token ; let while() find the : */

} else if (equals(c_token, "(")) {

fast_columns = 0; /* corey@cac */

dummy_func = NULL; /* no dummy variables active */

use_spec[df_no_use_specs++].at = perm_at(); /* it will match ()'s */

} else {

int col = (int) real(const_express(&a));

if (col < -2)

int_error(c_token, "Column must be >= -2");

use_spec[df_no_use_specs++].column = col;

}

} while (equals(c_token, ":") && ++c_token);

}

if (!END_OF_COMMAND && isstring(c_token)) {

if (df_binary)

int_error(NO_CARET, "Format string meaningless with binary data");

quote_str(df_format, c_token, MAX_LINE_LEN);

if (!valid_format(df_format))

int_error(c_token, "Please use a double conversion %lf");

c_token++; /* skip format */

}

/*{{{ int df_readline(v, max) */

/* do the hard work... read lines from file,

* - use blanks to get index number

* - ignore lines outside range of indices required

* - fill v[] based on using spec if given

int

df_readline(v, max)

double v[];

int max;

{

char *s;

assert(data_fp != NULL);

assert(!df_binary);

assert(max_line_len); /* alloc-ed in df_open() */

assert(max <= NCOL);

/* catch attempt to read past EOF on mixed-input */

if (df_eof)

return DF_EOF;

while ((s = df_gets()) != NULL)

/*{{{ process line */

{

int line_okay = 1;

int output = 0; /* how many numbers written to v[] */

++df_line_number;

df_no_cols = 0;

/*{{{ check for blank lines, and reject by index/every */

/*{{{ skip leading spaces */

while (isspace((int) *s))

++s; /* will skip the \n too, to point at \0 */

/*}}} */

/*{{{ skip comments */

if (is_comment(*s))

continue; /* ignore comments */

/*}}} */

/*{{{ check EOF on mixed data */

if (mixed_data_fp && is_EOF(*s)) {

df_eof = 1; /* trap attempts to read past EOF */

return DF_EOF;

}

/*}}} */

/*{{{ its a blank line - update counters and continue or return */

if (*s == 0) {

/* argh - this is complicated ! we need to

* ignore it if we haven't reached first index

* report EOF if passed last index

* report blank line unless we've already done 2 blank lines

* - I have probably missed some obvious way of doing all this,

* but its getting late

point_count = -1; /* restart counter within line */

if (++blank_count == 1) {

/* first blank line */

++line_count;

}

/* just reached end of a group/surface */

if (blank_count == 2) {

++df_current_index;

line_count = 0;

df_datum = -1;

/* ignore line if current_index has just become

* first required one - client doesn't want this

* blank line. While we're here, check for <=

* - we need to do it outside this conditional, but

* probably no extra cost at assembler level

if (df_current_index <= df_lower_index)

continue; /* dont tell client */

/* df_upper_index is MAXINT-1 if we are not doing index */

if (df_current_index > df_upper_index) {

/* oops - need to gobble rest of input if mixed */

if (mixed_data_fp)

continue;

else {

df_eof = 1;

return DF_EOF; /* no point continuing */

}

/* dont tell client if we haven't reached first index */

if (df_current_index < df_lower_index)

continue;

/* ignore blank lines after blank_index */

if (blank_count > 2)

continue;

return DF_FIRST_BLANK - (blank_count - 1);

}

/*}}} */

/* get here => was not blank */

blank_count = 0;

/*{{{ ignore points outside range of index */

/* we try to return end-of-file as soon as we pass upper index,

* but for mixed input stream, we must skip garbage

if (df_current_index < df_lower_index ||

df_current_index > df_upper_index ||

((df_current_index - df_lower_index) % df_index_step) != 0)

continue;

/*}}} */

/*{{{ reject points by every */

/* accept only lines with (line_count%everyline) == 0 */

if (line_count < firstline || line_count > lastline ||

(line_count - firstline) % everyline != 0)

continue;

/* update point_count. ignore point if point_count%everypoint != 0 */

if (++point_count < firstpoint || point_count > lastpoint ||

(point_count - firstpoint) % everypoint != 0)

continue;

/*}}} */

++df_datum;

/*{{{ do a sscanf */

if (*df_format) {

int i;

assert(NCOL == 7);

/* check we have room for at least 7 columns */

if (df_max_cols < 7) {

df_max_cols = 7;

df_column = (df_column_struct *) gp_realloc(df_column,

df_max_cols * sizeof(df_column_struct), "datafile columns");

}

df_no_cols = sscanf(line, df_format,

&df_column[0].datum,

&df_column[1].datum,

&df_column[2].datum,

&df_column[3].datum,

&df_column[4].datum,

&df_column[5].datum,

View remainder of file in raw view

gnuplot-old/src/datafile.c at axis_branch_base · gnuplot/gnuplot-old · GitHub

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