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

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/* 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 */

* 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)

* public variables declared in this file.

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

* int df_no_tic_specs - count of additional ticlabel columns

* int df_line_number - for error reporting

* int df_datum - increases with each data point

* int df_eof - end of file

* functions

* int df_open(char *file_name, int max_using, plot_header *plot)

* parses index / using on command line

* max_using is max no of 'using' columns allowed (obsolete?)

* plot_header is NULL if called from fit or set_palette code

* 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 a blank line, but no valid data],

* DF_EOF - end of file

* DF_UNDEFINED - undefined result during eval of extended using spec

* DF_MISSING - requested column matched that of 'set missing <foo>'

* DF_FIRST_BLANK - first consecutive blank line

* DF_SECOND_BLANK - second consecutive blank line

* DF_FOUND_KEY_TITLE - only relevant to first line of data

* DF_KEY_TITLE_MISSING and only for 'set key autotitle columnhead'

* DF_STRINGDATA - not currently used by anyone

* DF_COLUMN_HEADERS - first row used as headers rather than data

* 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 is slightly differently from previous versions of gnuplot...

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

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

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

/*}}} */

/* Daniel Sebald: added general binary 2d data support. (20 August 2004)

#include "datafile.h"

#include "datablock.h"

#include "alloc.h"

#include "axis.h"

#include "command.h"

#include "eval.h"

#include "gp_time.h"

#include "graphics.h"

#include "misc.h"

#include "parse.h"

#include "plot.h"

#include "plot2d.h" /* For reevaluate_plot_title() */

#include "readline.h"

#include "util.h"

#include "breaders.h"

#include "tabulate.h" /* For sanity check inblock != outblock */

#include "variable.h" /* For locale handling */

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

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

/* is it a comment line? */

#define is_comment(c) ((c) && (strchr(df_commentschars, (c)) != NULL))

/* Used to skip whitespace but not cross a field boundary */

#define NOTSEP (!df_separators || !strchr(df_separators,*s))

/*{{{ static fns */

static int check_missing(char *s);

static void expand_df_column(int);

static void clear_df_column_headers(void);

static char *df_gets(void);

static int df_tokenise(char *s);

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

static void plot_option_every(void);

static void plot_option_index(void);

static void plot_option_using(int);

static TBOOLEAN valid_format(const char *);

static void plot_ticlabel_using(int);

static void add_key_entry(char *temp_string, int df_datum);

static char * df_generate_pseudodata(void);

static char * df_generate_ascii_array_entry(void);

static int df_skip_bytes(off_t nbytes);

/*}}} */

/*{{{ variables */

enum COLUMN_TYPE { CT_DEFAULT, CT_STRING, CT_KEYLABEL,

CT_XTICLABEL, CT_X2TICLABEL, CT_YTICLABEL, CT_Y2TICLABEL,

CT_ZTICLABEL, CT_CBTICLABEL };

/* public (exported) 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 */

int df_last_col = 0; /* visible to user via STATS_columns */

int df_bad_matrix_values;

AXIS_INDEX df_axis[MAXDATACOLS];

TBOOLEAN df_matrix = FALSE; /* indicates if data originated from a 2D or 3D format */

void *df_pixeldata; /* pixel data from an external library (e.g. libgd) */

/* string representing missing values in ascii datafiles */

char *missing_val = NULL;

/* input field separators, NULL if whitespace is the separator */

char *df_separators = NULL;

/* comments chars */

char *df_commentschars = 0;

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

TBOOLEAN plotted_data_from_stdin = FALSE;

/* This flag is controlled by 'set/unset datafile columnheaders'.

* Even if it is FALSE, columnheader processing may still be triggered

* implicitly by use of the columheader function or keyword

* in a using spec or title.

TBOOLEAN df_columnheaders = FALSE;

/* Setting this allows the parser to recognize Fortran D or Q */

/* format constants in the input file. But it slows things down */

TBOOLEAN df_fortran_constants = FALSE;

/* Setting this disables re-initialization of the floating point exception */

/* handler before every expression evaluation in a using spec. */

TBOOLEAN df_nofpe_trap = FALSE;

/* private variables */

/* Bookkeeping for df_fgets() and df_gets().

* Must be initialized before any calls to either function.

static char *df_line = NULL;

static size_t max_line_len = 0;

#define DATA_LINE_BUFSIZ 160

static FILE *data_fp = NULL;

#if defined(PIPES)

static TBOOLEAN df_pipe_open = FALSE;

#endif

#if defined(HAVE_FDOPEN)

static int data_fd = -2; /* only used for file redirection */

#endif

static TBOOLEAN mixed_data_fp = FALSE; /* inline data */

char *df_filename = NULL; /* name of data file */

static int df_eof = 0;

static int df_no_tic_specs; /* ticlabel columns not counted in df_no_use_specs */

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

# define MAXINT INT_MAX /* from <limits.h> */

#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 */

static int df_last_index_read; /* last mesh we actually read data from */

/* stuff for named index support */

static char *indexname = NULL;

static TBOOLEAN index_found = FALSE;

static int df_longest_columnhead = 0;

/* stuff for every point:line */

static TBOOLEAN set_every = FALSE;

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 */

/* for ascii file "skip" lines at head of file */

static int df_skip_at_front = 0;

/* for pseudo-data (1 if filename = '+'; 2 if filename = '++') */

static int df_pseudodata = 0;

static int df_pseudorecord = 0;

static int df_pseudospan = 0;

static double df_pseudovalue_0 = 0;

static double df_pseudovalue_1 = 0;

/* for datablocks */

static TBOOLEAN df_datablock = FALSE;

static char **df_datablock_line = NULL;

/* for arrays */

static int df_array_index = 0;

static char *df_arrayname = NULL;

/* track dimensions of input matrix/array/image */

static unsigned int df_xpixels;

static unsigned int df_ypixels;

static TBOOLEAN df_transpose;

/* parsing stuff */

struct use_spec_s use_spec[MAXDATACOLS];

static char *df_format = NULL;

static char *df_binary_format = NULL;

TBOOLEAN evaluate_inside_using = FALSE;

TBOOLEAN df_warn_on_missing_columnheader = FALSE;

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

* dynamic array of this structure

typedef struct df_column_struct {

double datum;

enum DF_STATUS good;

char *position; /* points to start of this field in current line */

char *header; /* points to copy of the header for this column */

} 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; /* total number of columns found in input lines */

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

char *df_tokens[MAXDATACOLS]; /* filled in by df_tokenise */

static char *df_stringexpression[MAXDATACOLS]; /* filled in after evaluate_at() */

static struct curve_points *df_current_plot; /* used to process histogram labels + key entries */

struct value df_strings[MAXDATACOLS]; /* used only by TABLESTYLE */

static TBOOLEAN df_tabulate_strings = FALSE; /* used only by TABLESTYLE */

/* These control the handling of fields in the first row of a data file.

* See also parse_1st_row_as_headers.

#define NO_COLUMN_HEADER (-99) /* some value that can never be a real column */

static int column_for_key_title = NO_COLUMN_HEADER;

static TBOOLEAN df_already_got_headers = FALSE;

char *df_key_title = NULL; /* filled in from column header if requested */

struct at_type *df_plot_title_at; /* used for deferred evaluation of plot title */

/* Binary *read* variables used by df_readbinary().

* There is a confusing difference between the ascii and binary "matrix" keywords.

* Ascii matrix data by default is interpreted as having an implicit uniform grid

* of x and y coords that are not actually present in the data file.

* The equivalent binary data format is called "binary general".

* In both of these cases the internal flag df_nonuniform_matrix is FALSE;

* Binary matrix data contains explicit y values in the first row, and explicit x

* values in the first column. This is signalled by "binary matrix".

* In this case the internal flag df_nonuniform_matrix is TRUE.

* EAM May 2011 - Add a keyword "nonuniform matrix" to indicate ascii matrix data

* in the same format as "binary matrix", i.e. with explicit x and y coordinates.

* EAM Jul 2014 - Add keywords "columnheaders" and "rowheaders" to indicate ascii

* matrix data in the uniform grid format containing labels in row 1 and column 1.

static TBOOLEAN df_read_binary;

static TBOOLEAN df_nonuniform_matrix;

static TBOOLEAN df_matrix_columnheaders, df_matrix_rowheaders;

static int df_plot_mode;

static int df_readascii(double [], int);

static int df_readbinary(double [], int);

static void initialize_use_spec(void);

static void initialize_plot_style(struct curve_points *);

static void initialize_binary_vars(void);

static void df_insert_scanned_use_spec(int);

static void adjust_binary_use_spec(struct curve_points *);

static void clear_binary_records(df_records_type);

static void plot_option_binary_format(char *);

static void plot_option_binary(TBOOLEAN, TBOOLEAN);

static void plot_option_array(void);

static TBOOLEAN rotation_matrix_2D(double R[][2], double);

static TBOOLEAN rotation_matrix_3D(double P[][3], double *);

static int token2tuple(double *, int);

static void df_determine_matrix_info(FILE *);

static void df_swap_bytes_by_endianess(char *, int, int);

typedef enum df_multivalue_type {

DF_DELTA,

DF_FLIP_AXIS,

DF_FLIP,

DF_SCAN,

DF_ORIGIN,

DF_CENTER,

DF_ROTATION,

DF_PERPENDICULAR,

DF_SKIP

} df_multivalue_type;

static void plot_option_multivalued(df_multivalue_type,int);

char *df_endian[DF_ENDIAN_TYPE_LENGTH] = {

"little",

"pdp (middle)",

"swapped pdp (dimmle)",

"big"

};

#define SUPPORT_MIDDLE_ENDIAN 1

#if SUPPORT_MIDDLE_ENDIAN

/* To generate a swap, take the bit-wise complement of the lowest two bits. */

typedef enum df_byte_read_order_type {

DF_0123,

DF_1032,

DF_2301,

DF_3210

} df_byte_read_order_type;

/* First argument, this program's endianess. Second argument, file's endianess.

* Don't use directly. Use 'byte_read_order()' function instead.*/

static char df_byte_read_order_map[4][4] = {

{DF_0123, DF_1032, DF_2301, DF_3210},

{DF_1032, DF_0123, DF_1032, DF_2301},

{DF_2301, DF_1032, DF_0123, DF_1032},

{DF_3210, DF_2301, DF_1032, DF_0123}

};

static long long_0x2468 = 0x2468;

#define TEST_BIG_PDP ( (((char *)&long_0x2468)[0] < 3) ? DF_BIG_ENDIAN : DF_PDP_ENDIAN )

#define THIS_COMPILER_ENDIAN ( (((char *)&long_0x2468)[0] < 5) ? TEST_BIG_PDP : DF_LITTLE_ENDIAN )

/* Argument is file's endianess type. */

static df_byte_read_order_type byte_read_order(df_endianess_type);

/* Logical variables indicating information about data file. */

TBOOLEAN df_binary_file;

TBOOLEAN df_matrix_file;

static int df_M_count;

static int df_N_count;

static int df_O_count;

/* Initially set to default and then possibly altered by command line. */

df_binary_file_record_struct *df_bin_record = 0;

/* Default settings. */

df_binary_file_record_struct *df_bin_record_default = 0;

/* Settings that are transferred to default upon reset. */

df_binary_file_record_struct df_bin_record_reset = {

{-1, 0, 0},

{1, 1, 1},

DF_TRANSLATE_DEFAULT,

{0, 0, 0},

{0, 0, 1},

{DF_SCAN_POINT, DF_SCAN_LINE, DF_SCAN_PLANE},

FALSE,

{0, 0, 0},

{1, 1, 1},

{0, 0, 0},

DF_TRANSLATE_DEFAULT,

{0, 0, 0},

0, 0, /* submatrix size */

NULL /* data_memory */

};

int df_max_num_bin_records = 0, df_num_bin_records, df_bin_record_count;

int df_max_num_bin_records_default = 0, df_num_bin_records_default;

/* Used to mark the location of a blank line in the original data input file */

struct coordinate blank_data_line = {UNDEFINED, -999, -999, -999, -999, -999, -999, -999};

static void gpbin_filetype_function(void);

static void raw_filetype_function(void);

static void avs_filetype_function(void);

static void (*binary_input_function)(void); /* Will point to one of the above */

static void auto_filetype_function(void){} /* Just a placeholder for auto */

struct gen_ftable df_bin_filetype_table[] = {

{"avs", avs_filetype_function},

{"bin", raw_filetype_function},

{"edf", edf_filetype_function},

{"ehf", edf_filetype_function},

{"gif", gif_filetype_function},

{"gpbin", gpbin_filetype_function},

{"jpeg", jpeg_filetype_function},

{"jpg", jpeg_filetype_function},

{"png", png_filetype_function},

{"raw", raw_filetype_function},

{"rgb", raw_filetype_function},

{"auto", auto_filetype_function},

{NULL, NULL}

};

#define RAW_FILETYPE 1

/* Initially set to default and then possibly altered by command line. */

static int df_bin_filetype;

/* Default setting. */

static int df_bin_filetype_default;

static df_endianess_type df_bin_file_endianess_default;

/* Setting that is transferred to default upon reset. */

static int df_bin_filetype_reset = -1;

#define DF_BIN_FILE_ENDIANESS_RESET THIS_COMPILER_ENDIAN

/* This one is needed by breaders.c */

df_endianess_type df_bin_file_endianess;

typedef struct df_bin_scan_table_2D_struct {

char *string;

df_sample_scan_type scan[3];

} df_bin_scan_table_2D_struct;

df_bin_scan_table_2D_struct df_bin_scan_table_2D[] = {

{"xy", {DF_SCAN_POINT, DF_SCAN_LINE, DF_SCAN_PLANE}},

{"yx", {DF_SCAN_LINE, DF_SCAN_POINT, DF_SCAN_PLANE}},

{"tr", {DF_SCAN_POINT, DF_SCAN_LINE, DF_SCAN_PLANE}},

{"rt", {DF_SCAN_LINE, DF_SCAN_POINT, DF_SCAN_PLANE}}

};

#define TRANSPOSE_INDEX 1

typedef struct df_bin_scan_table_3D_struct {

char *string;

df_sample_scan_type scan[3];

} df_bin_scan_table_3D_struct;

df_bin_scan_table_3D_struct df_bin_scan_table_3D[] = {

{"xyz", {DF_SCAN_POINT, DF_SCAN_LINE, DF_SCAN_PLANE}},

{"zxy", {DF_SCAN_LINE, DF_SCAN_PLANE, DF_SCAN_POINT}},

{"yzx", {DF_SCAN_PLANE, DF_SCAN_POINT, DF_SCAN_LINE}},

{"yxz", {DF_SCAN_LINE, DF_SCAN_POINT, DF_SCAN_PLANE}},

{"xzy", {DF_SCAN_POINT, DF_SCAN_PLANE, DF_SCAN_LINE}},

{"zyx", {DF_SCAN_PLANE, DF_SCAN_LINE, DF_SCAN_POINT}},

{"trz", {DF_SCAN_POINT, DF_SCAN_LINE, DF_SCAN_PLANE}},

{"ztr", {DF_SCAN_LINE, DF_SCAN_PLANE, DF_SCAN_POINT}},

{"rzt", {DF_SCAN_PLANE, DF_SCAN_POINT, DF_SCAN_LINE}},

{"rtz", {DF_SCAN_LINE, DF_SCAN_POINT, DF_SCAN_PLANE}},

{"tzr", {DF_SCAN_POINT, DF_SCAN_PLANE, DF_SCAN_LINE}},

{"zrt", {DF_SCAN_PLANE, DF_SCAN_LINE, DF_SCAN_POINT}}

};

/* Names for machine dependent field sizes. */

char *ch_names[] = {"char","schar","c"};

char *uc_names[] = {"uchar"};

char *sh_names[] = {"short"};

char *us_names[] = {"ushort"};

char *in_names[] = {"int","sint","i","d"};

char *ui_names[] = {"uint","u"};

char *lo_names[] = {"long","ld"};

char *ul_names[] = {"ulong","lu"};

char *fl_names[] = {"float","f"};

char *db_names[] = {"double","lf"};

/* Machine independent names. */

char *byte_names[] = {"int8","byte"};

char *ubyte_names[] = {"uint8","ubyte"};

char *word_names[] = {"int16","word"};

char *uword_names[] = {"uint16","uword"};

char *word2_names[] = {"int32"};

char *uword2_names[] = {"uint32"};

char *word4_names[] = {"int64"};

char *uword4_names[] = {"uint64"};

char *float_names[] = {"float32"};

char *float2_names[] = {"float64"};

typedef struct df_binary_details_struct {

char **name;

unsigned short no_names;

df_binary_type_struct type;

} df_binary_details_struct;

typedef struct df_binary_tables_struct {

df_binary_details_struct *group;

unsigned short group_length;

} df_binary_tables_struct;

df_binary_details_struct df_binary_details[] = {

{ch_names,sizeof(ch_names)/sizeof(ch_names[0]),{DF_CHAR,sizeof(char)}},

{uc_names,sizeof(uc_names)/sizeof(uc_names[0]),{DF_UCHAR,sizeof(unsigned char)}},

{sh_names,sizeof(sh_names)/sizeof(sh_names[0]),{DF_SHORT,sizeof(short)}},

{us_names,sizeof(us_names)/sizeof(us_names[0]),{DF_USHORT,sizeof(unsigned short)}},

{in_names,sizeof(in_names)/sizeof(in_names[0]),{DF_INT,sizeof(int)}},

{ui_names,sizeof(ui_names)/sizeof(ui_names[0]),{DF_UINT,sizeof(unsigned int)}},

{lo_names,sizeof(lo_names)/sizeof(lo_names[0]),{DF_LONG,sizeof(long)}},

{ul_names,sizeof(ul_names)/sizeof(ul_names[0]),{DF_ULONG,sizeof(unsigned long)}},

{fl_names,sizeof(fl_names)/sizeof(fl_names[0]),{DF_FLOAT,sizeof(float)}},

{db_names,sizeof(db_names)/sizeof(db_names[0]),{DF_DOUBLE,sizeof(double)}},

{NULL,0, {DF_LONGLONG,sizeof(long long)}},

{NULL,0, {DF_ULONGLONG,sizeof(unsigned long long)}}

};

df_binary_details_struct df_binary_details_independent[] = {

{byte_names,sizeof(byte_names)/sizeof(byte_names[0]),{SIGNED_TEST(1),1}},

{ubyte_names,sizeof(ubyte_names)/sizeof(ubyte_names[0]),{UNSIGNED_TEST(1),1}},

{word_names,sizeof(word_names)/sizeof(word_names[0]),{SIGNED_TEST(2),2}},

{uword_names,sizeof(uword_names)/sizeof(uword_names[0]),{UNSIGNED_TEST(2),2}},

{word2_names,sizeof(word2_names)/sizeof(word2_names[0]),{SIGNED_TEST(4),4}},

{uword2_names,sizeof(uword2_names)/sizeof(uword2_names[0]),{UNSIGNED_TEST(4),4}},

{word4_names,sizeof(word4_names)/sizeof(word4_names[0]),{SIGNED_TEST(8),8}},

{uword4_names,sizeof(uword4_names)/sizeof(uword4_names[0]),{UNSIGNED_TEST(8),8}},

{float_names,sizeof(float_names)/sizeof(float_names[0]),{FLOAT_TEST(4),4}},

{float2_names,sizeof(float2_names)/sizeof(float2_names[0]),{FLOAT_TEST(8),8}}

};

int df_no_bin_cols; /* binary columns to read */

df_binary_tables_struct df_binary_tables[] = {

{df_binary_details,sizeof(df_binary_details)/sizeof(df_binary_details[0])},

{df_binary_details_independent,sizeof(df_binary_details_independent)/sizeof(df_binary_details_independent[0])}

};

/* Information about binary data structure, to be determined by the

* using and format options. This should be one greater than df_no_bin_cols.

static df_column_bininfo_struct *df_column_bininfo = NULL; /* allocate space as needed */

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

static const char *matrix_general_binary_conflict_msg

= "Conflict between some matrix binary and general binary keywords";

#endif

/*}}} */

/* Initialize input buffer used by df_gets and df_fgets. */

/* Called via reset_command() on program entry. */

void

df_init()

{

if (max_line_len < DATA_LINE_BUFSIZ) {

max_line_len = DATA_LINE_BUFSIZ;

df_line = gp_alloc(max_line_len, "datafile line buffer");

}

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

static char *

df_gets()

{

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

if (mixed_data_fp && interactive)

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

/* Special pseudofiles '+' and '++' return coords of sample */

if (df_pseudodata)

return df_generate_pseudodata();

if (df_datablock)

return *(df_datablock_line++);

if (df_array)

return df_generate_ascii_array_entry();

return df_fgets(data_fp);

}

/*}}} */

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

* This one is shared by df_gets() and by datablock.c:datablock_command

char *

df_fgets( FILE *fin )

{

int len = 0;

if (!fgets(df_line, max_line_len, fin))

return NULL;

if (mixed_data_fp)

++inline_num;

for (;;) {

len += strlen(df_line + len);

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

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

* Strip the trailing linefeed and return

df_line[len - 1] = 0;

return df_line;

}

if ((max_line_len - len) < 32)

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

if (!fgets(df_line + len, max_line_len - len, fin))

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

}

/* NOTREACHED */

return NULL;

}

/*}}} */

static int

df_tokenise(char *s)

{

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

* and can understand fortran quad format

TBOOLEAN in_string;

int i;

/* "here data" lines may end in \n rather than \0. */

/* DOS/Windows lines may end in \r rather than \0. */

if (s[strlen(s)-1] == '\n' || s[strlen(s)-1] == '\r')

s[strlen(s)-1] = '\0';

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

df_tokens[i] = NULL;

df_no_cols = 0;

while (*s) {

/* We may poke at 2 new fields before coming back here - make sure there is room */

if (df_max_cols <= df_no_cols + 2)

expand_df_column((df_max_cols < 20) ? df_max_cols+20 : 2*df_max_cols);

/* have always skipped spaces at this point */

df_column[df_no_cols].position = s;

in_string = FALSE;

/* Keep pointer to start of this token if user wanted it for

* anything, particularly if it is a string */

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

if (df_no_cols == use_spec[i].column-1) {

df_tokens[i] = s;

if (use_spec[i].expected_type == CT_STRING)

df_column[df_no_cols].good = DF_GOOD;

}

/* CSV files must accept numbers inside quotes also,

* so we step past the quote */

if (*s == '"' && df_separators != NULL) {

in_string = TRUE;

df_column[df_no_cols].position = ++s;

}

if (*s == '"') {

/* treat contents of a quoted string as single column */

in_string = !in_string;

df_column[df_no_cols].good = DF_STRINGDATA;

} else if (check_missing(s)) {

df_column[df_no_cols].good = DF_MISSING;

df_column[df_no_cols].datum = not_a_number();

df_column[df_no_cols].position = NULL;

} else {

int used;

int count;

int dfncp1 = df_no_cols + 1;

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

/* only scanf the field if it is mentioned in one of the using specs */

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)

)

) {

/* This was the [slow] code used through version 4.0

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

/* Use strtod() because

* - it is faster than sscanf()

* - sscanf(... %n ...) may not be portable

* - it allows error checking

* - atof() does not return a count or new position

char *next;

df_column[df_no_cols].datum = strtod(s, &next);

used = next - s;

count = (used) ? 1 : 0;

} else {

/* skip any space at start of column */

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

++s;

count = (*s && NOTSEP) ? 1 : 0;

/* skip chars to end of column */

used = 0;

if (df_separators != NULL && in_string) {

++s;

while (*s && *s != '"');

in_string = FALSE;

}

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

&& (*s != NUL) && NOTSEP)

++s;

}

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

* 'used' is only safe if count is 1

if (df_fortran_constants && count == 1 &&

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

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

/* HBB 20001221: avoid breaking parsing of time/date

* strings like 01Dec2000 that would be caused by

* overwriting the 'D' with an 'e'... */

char *endptr;

char save_char = s[used];

/* might be fortran double */

s[used] = 'e';

/* and try again */

df_column[df_no_cols].datum = strtod(s, &endptr);

count = (endptr == s) ? 0 : 1;

s[used] = save_char;

}

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

if (isnan(df_column[df_no_cols].datum)) {

df_column[df_no_cols].good = DF_UNDEFINED;

FPRINTF((stderr,"NaN in column %d\n", df_no_cols));

}

++df_no_cols;

/* If we are in a quoted string, skip to end of quote */

if (in_string) {

s++;

while (*s && (unsigned char) *s != '"');

}

/* skip to 1st character in the next field */

if (df_separators != NULL && !df_array) {

/* skip to next separator or end of line */

while ((*s != '\0') && (*s != '\n') && NOTSEP)

++s;

if ((*s == '\0') || (*s == '\n')) /* End of line; we're done */

break;

/* step over field separator */

++s;

/* skip whitespace at start of next field */

while ((*s == ' ' || *s == '\t') && NOTSEP)

++s;

if ((*s == '\0') || (*s == '\n')) { /* Last field is empty */

df_column[df_no_cols].good = DF_MISSING;

df_column[df_no_cols].datum = not_a_number();

df_column[df_no_cols].position = NULL;

++df_no_cols;

break;

}

} else {

/* skip trash chars remaining in this column */

while ((*s != '\0') && (*s != '\n') && !isspace((unsigned char) *s))

++s;

/* skip whitespace to start of next column */

while (isspace((unsigned char) *s) && *s != '\n')

++s;

}

return df_no_cols;

}

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

/* Reads a matrix from a text file and stores it as floats in allocated

* memory.

* IMPORTANT NOTE: The routine returns the memory pointer for that matrix,

* but does not retain the pointer. Maintenance of the memory is left to

* the calling code.

static float *

df_read_matrix(int *rows, int *cols)

{

int max_rows = 0;

int c;

float *linearized_matrix = NULL;

char *s;

int index = 0;

df_bad_matrix_values = 0;

*rows = 0;

*cols = 0;

for (;;) {

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

df_eof = 1;

/* NULL if we have not read anything yet */

return linearized_matrix;

}

/* skip leading spaces */

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

++s;

/* skip blank lines and comments */

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

/* except that some comments hide an index name */

if (indexname) {

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

++s;

if (*s && !strncmp(s, indexname, strlen(indexname)))

index_found = TRUE;

}

/* This whole section copied with minor tweaks from df_readascii() */

if (++blank_count == 1) {

/* first blank line */

if (linearized_matrix)

return linearized_matrix;

if (indexname && !index_found)

continue;

if (df_current_index < df_lower_index)

continue;

}

if (blank_count == 2) {

/* just reached the end of a data block */

++df_current_index;

if (indexname && index_found) {

df_eof = 1;

return linearized_matrix;

}

if (df_current_index <= df_lower_index)

continue;

if (df_current_index > df_upper_index) {

df_eof = 1;

return linearized_matrix;

}

} else {

/* Ignore any blank lines beyond the 2nd */

continue;

}

/* get here => was not blank */

df_last_index_read = df_current_index;

/* TODO: Handle columnheaders for 2nd and subsequent data blocks?

* if (blank_count >= 2) { do something }

blank_count = 0;

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

df_eof = 1;

return linearized_matrix;

}

c = df_tokenise(s);

if (!c)

return linearized_matrix;

/* If the first row of matrix data contains column headers */

if (!df_already_got_headers && df_matrix_columnheaders && *rows == 0) {

int i;

char *temp_string;

df_already_got_headers = TRUE;

for (i = (df_matrix_rowheaders ? 1 :0); i < c; i++) {

double xpos = df_matrix_rowheaders ? (i-1) : i;

if (use_spec[0].at) {

struct value a;

df_column[0].datum = xpos;

df_column[0].good = DF_GOOD;

evaluate_inside_using = TRUE;

evaluate_at(use_spec[0].at, &a);

evaluate_inside_using = FALSE;

xpos = real(&a);

}

temp_string = df_parse_string_field(df_column[i].position);

add_tic_user(&axis_array[FIRST_X_AXIS], temp_string, xpos, -1);

free(temp_string);

}

continue;

}

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

/* it's not regular */

if (linearized_matrix)

free(linearized_matrix);

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

}

*cols = c;

++*rows;

if (*rows > max_rows) {

max_rows = GPMAX(2*max_rows,1);

linearized_matrix = gp_realloc(linearized_matrix,

*cols * max_rows * sizeof(float),

"df_matrix");

}

/* store data */

{

int i;

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

/* First column in "matrix rowheaders" is a ytic label */

if (df_matrix_rowheaders && i == 0) {

char *temp_string;

double ypos = *rows - 1;

if (use_spec[1].at) {

/* The save/restore is to make sure 1:(f($2)):3 works */

struct value a;

double save = df_column[1].datum;

df_column[1].datum = ypos;

evaluate_inside_using = TRUE;

evaluate_at(use_spec[1].at, &a);

evaluate_inside_using = FALSE;

ypos = real(&a);

df_column[1].datum = save;

View remainder of file in raw view

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

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