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Aminet 30
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gnuplot-3.7src.lha
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gnuplot-3.7src
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gnuplot-3.7.lha
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gnuplot-3.7
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util.c
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C/C++ Source or Header
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1998-12-09
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657 lines
#ifndef lint
static char *RCSid = "$Id: util.c,v 1.46 1998/06/18 14:55:20 ddenholm Exp $";
#endif
/* GNUPLOT - util.c */
/*[
* Copyright 1986 - 1993, 1998 Thomas Williams, Colin Kelley
*
* 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.
]*/
#include "plot.h"
#include "setshow.h" /* for month names etc */
/* TRUE if command just typed; becomes FALSE whenever we
* send some other output to screen. If FALSE, the command line
* will be echoed to the screen before the ^ error message.
*/
TBOOLEAN screen_ok;
static char *num_to_str __PROTO((double r));
static void parse_esc __PROTO((char *instr));
/*
* chr_in_str() compares the characters in the string of token number t_num
* with c, and returns TRUE if a match was found.
*/
int chr_in_str(t_num, c)
int t_num;
int c;
{
register int i;
if (!token[t_num].is_token)
return (FALSE); /* must be a value--can't be equal */
for (i = 0; i < token[t_num].length; i++) {
if (input_line[token[t_num].start_index + i] == c)
return (TRUE);
}
return FALSE;
}
/*
* equals() compares string value of token number t_num with str[], and
* returns TRUE if they are identical.
*/
int equals(t_num, str)
int t_num;
char *str;
{
register int i;
if (!token[t_num].is_token)
return (FALSE); /* must be a value--can't be equal */
for (i = 0; i < token[t_num].length; i++) {
if (input_line[token[t_num].start_index + i] != str[i])
return (FALSE);
}
/* now return TRUE if at end of str[], FALSE if not */
return (str[i] == NUL);
}
/*
* almost_equals() compares string value of token number t_num with str[], and
* returns TRUE if they are identical up to the first $ in str[].
*/
int almost_equals(t_num, str)
int t_num;
char *str;
{
register int i;
register int after = 0;
register int start = token[t_num].start_index;
register int length = token[t_num].length;
if (!token[t_num].is_token)
return (FALSE); /* must be a value--can't be equal */
for (i = 0; i < length + after; i++) {
if (str[i] != input_line[start + i]) {
if (str[i] != '$')
return (FALSE);
else {
after = 1;
start--; /* back up token ptr */
}
}
}
/* i now beyond end of token string */
return (after || str[i] == '$' || str[i] == NUL);
}
int isstring(t_num)
int t_num;
{
return (token[t_num].is_token &&
(input_line[token[t_num].start_index] == '\'' ||
input_line[token[t_num].start_index] == '"'));
}
int isanumber(t_num)
int t_num;
{
return (!token[t_num].is_token);
}
int isletter(t_num)
int t_num;
{
return (token[t_num].is_token &&
((isalpha((int)input_line[token[t_num].start_index])) ||
(input_line[token[t_num].start_index] == '_')));
}
/*
* is_definition() returns TRUE if the next tokens are of the form
* identifier =
* -or-
* identifier ( identifer {,identifier} ) =
*/
int is_definition(t_num)
int t_num;
{
/* variable? */
if (isletter(t_num) && equals(t_num + 1, "="))
return 1;
/* function? */
/* look for dummy variables */
if (isletter(t_num) && equals(t_num + 1, "(") && isletter(t_num + 2)) {
t_num += 3; /* point past first dummy */
while (equals(t_num, ",")) {
if (!isletter(++t_num))
return 0;
t_num += 1;
}
return (equals(t_num, ")") && equals(t_num + 1, "="));
}
/* neither */
return 0;
}
/*
* copy_str() copies the string in token number t_num into str, appending
* a null. No more than max chars are copied (including \0).
*/
void copy_str(str, t_num, max)
char str[];
int t_num;
int max;
{
register int i = 0;
register int start = token[t_num].start_index;
register int count;
if ((count = token[t_num].length) >= max) {
count = max - 1;
FPRINTF((stderr, "str buffer overflow in copy_str"));
}
do {
str[i++] = input_line[start++];
} while (i != count);
str[i] = NUL;
}
/* length of token string */
int token_len(t_num)
int t_num;
{
return (token[t_num].length);
}
/*
* quote_str() does the same thing as copy_str, except it ignores the
* quotes at both ends. This seems redundant, but is done for
* efficency.
*/
void quote_str(str, t_num, max)
char str[];
int t_num;
int max;
{
register int i = 0;
register int start = token[t_num].start_index + 1;
register int count;
if ((count = token[t_num].length - 2) >= max) {
count = max - 1;
FPRINTF((stderr, "str buffer overflow in quote_str"));
}
if (count > 0) {
do {
str[i++] = input_line[start++];
} while (i != count);
}
str[i] = NUL;
/* convert \t and \nnn (octal) to char if in double quotes */
if (input_line[token[t_num].start_index] == '"')
parse_esc(str);
}
/*
* capture() copies into str[] the part of input_line[] which lies between
* the begining of token[start] and end of token[end].
*/
void capture(str, start, end, max)
char str[];
int start, end;
int max;
{
register int i, e;
e = token[end].start_index + token[end].length;
if (e - token[start].start_index >= max) {
e = token[start].start_index + max - 1;
FPRINTF((stderr, "str buffer overflow in capture"));
}
for (i = token[start].start_index; i < e && input_line[i] != NUL; i++)
*str++ = input_line[i];
*str = NUL;
}
/*
* m_capture() is similar to capture(), but it mallocs storage for the
* string.
*/
void m_capture(str, start, end)
char **str;
int start, end;
{
register int i, e;
register char *s;
if (*str) /* previous pointer to malloc'd memory there */
free(*str);
e = token[end].start_index + token[end].length;
*str = gp_alloc((unsigned long) (e - token[start].start_index + 1), "string");
s = *str;
for (i = token[start].start_index; i < e && input_line[i] != NUL; i++)
*s++ = input_line[i];
*s = NUL;
}
/*
* m_quote_capture() is similar to m_capture(), but it removes
quotes from either end if the string.
*/
void m_quote_capture(str, start, end)
char **str;
int start, end;
{
register int i, e, escflag = 0;
register char *s;
if (*str) /* previous pointer to malloc'd memory there */
free(*str);
e = token[end].start_index + token[end].length - 1;
*str = gp_alloc((unsigned long) (e - token[start].start_index + 1), "string");
s = *str;
for (i = token[start].start_index + 1; i < e && input_line[i] != NUL; i++)
if ((*s++ = input_line[i]) == '\\') ++escflag;
*s = NUL;
if (escflag) parse_esc(*str);
}
void convert(val_ptr, t_num)
struct value *val_ptr;
int t_num;
{
*val_ptr = token[t_num].l_val;
}
static char *num_to_str(r)
double r;
{
static int i = 0;
static char s[4][25];
int j = i++;
if (i > 3)
i = 0;
sprintf(s[j], "%.15g", r);
if (strchr(s[j], '.') == NULL &&
strchr(s[j], 'e') == NULL &&
strchr(s[j], 'E') == NULL)
strcat(s[j], ".0");
return s[j];
}
void disp_value(fp, val)
FILE *fp;
struct value *val;
{
switch (val->type) {
case INTGR:
fprintf(fp, "%d", val->v.int_val);
break;
case CMPLX:
if (val->v.cmplx_val.imag != 0.0)
fprintf(fp, "{%s, %s}",
num_to_str(val->v.cmplx_val.real),
num_to_str(val->v.cmplx_val.imag));
else
fprintf(fp, "%s",
num_to_str(val->v.cmplx_val.real));
break;
default:
int_error("unknown type in disp_value()", NO_CARET);
}
}
double real(val) /* returns the real part of val */
struct value *val;
{
switch (val->type) {
case INTGR:
return ((double) val->v.int_val);
case CMPLX:
return (val->v.cmplx_val.real);
}
int_error("unknown type in real()", NO_CARET);
/* NOTREACHED */
return ((double) 0.0);
}
double imag(val) /* returns the imag part of val */
struct value *val;
{
switch (val->type) {
case INTGR:
return (0.0);
case CMPLX:
return (val->v.cmplx_val.imag);
}
int_error("unknown type in imag()", NO_CARET);
/* NOTREACHED */
return ((double) 0.0);
}
double magnitude(val) /* returns the magnitude of val */
struct value *val;
{
switch (val->type) {
case INTGR:
return ((double) abs(val->v.int_val));
case CMPLX:
return (sqrt(val->v.cmplx_val.real *
val->v.cmplx_val.real +
val->v.cmplx_val.imag *
val->v.cmplx_val.imag));
}
int_error("unknown type in magnitude()", NO_CARET);
/* NOTREACHED */
return ((double) 0.0);
}
double angle(val) /* returns the angle of val */
struct value *val;
{
switch (val->type) {
case INTGR:
return ((val->v.int_val >= 0) ? 0.0 : Pi);
case CMPLX:
if (val->v.cmplx_val.imag == 0.0) {
if (val->v.cmplx_val.real >= 0.0)
return (0.0);
else
return (Pi);
}
return (atan2(val->v.cmplx_val.imag,
val->v.cmplx_val.real));
}
int_error("unknown type in angle()", NO_CARET);
/* NOTREACHED */
return ((double) 0.0);
}
struct value *
Gcomplex(a, realpart, imagpart)
struct value *a;
double realpart, imagpart;
{
a->type = CMPLX;
a->v.cmplx_val.real = realpart;
a->v.cmplx_val.imag = imagpart;
return (a);
}
struct value *
Ginteger(a, i)
struct value *a;
int i;
{
a->type = INTGR;
a->v.int_val = i;
return (a);
}
void os_error(str, t_num)
char str[];
int t_num;
{
#ifdef VMS
static status[2] =
{1, 0}; /* 1 is count of error msgs */
#endif /* VMS */
register int i;
/* reprint line if screen has been written to */
if (t_num != NO_CARET) { /* put caret under error */
if (!screen_ok)
fprintf(stderr, "\n%s%s\n", PROMPT, input_line);
for (i = 0; i < sizeof(PROMPT) - 1; i++)
(void) putc(' ', stderr);
for (i = 0; i < token[t_num].start_index; i++) {
(void) putc((input_line[i] == '\t') ? '\t' : ' ', stderr);
}
(void) putc('^', stderr);
(void) putc('\n', stderr);
}
for (i = 0; i < sizeof(PROMPT) - 1; i++)
(void) putc(' ', stderr);
fputs(str, stderr);
putc('\n', stderr);
for (i = 0; i < sizeof(PROMPT) - 1; i++)
(void) putc(' ', stderr);
if (!interactive) {
if (infile_name != NULL)
fprintf(stderr, "\"%s\", line %d: ", infile_name, inline_num);
else
fprintf(stderr, "line %d: ", inline_num);
}
#ifdef VMS
status[1] = vaxc$errno;
sys$putmsg(status);
(void) putc('\n', stderr);
#else /* VMS */
fprintf(stderr, "(%s)\n\n", strerror(errno));
#endif /* VMS */
bail_to_command_line();
}
void int_error(str, t_num)
char str[];
int t_num;
{
register int i;
/* reprint line if screen has been written to */
if (t_num != NO_CARET) { /* put caret under error */
if (!screen_ok)
fprintf(stderr, "\n%s%s\n", PROMPT, input_line);
for (i = 0; i < sizeof(PROMPT) - 1; i++)
(void) putc(' ', stderr);
for (i = 0; i < token[t_num].start_index; i++) {
(void) putc((input_line[i] == '\t') ? '\t' : ' ', stderr);
}
(void) putc('^', stderr);
(void) putc('\n', stderr);
}
for (i = 0; i < sizeof(PROMPT) - 1; i++)
(void) putc(' ', stderr);
if (!interactive) {
if (infile_name != NULL)
fprintf(stderr, "\"%s\", line %d: ", infile_name, inline_num);
else
fprintf(stderr, "line %d: ", inline_num);
}
fputs(str, stderr);
fputs("\n\n", stderr);
bail_to_command_line();
}
/* Warn without bailing out to command line. Not a user error */
void int_warn(str, t_num)
char str[];
int t_num;
{
register int i;
/* reprint line if screen has been written to */
if (t_num != NO_CARET) { /* put caret under error */
if (!screen_ok)
fprintf(stderr, "\n%s%s\n", PROMPT, input_line);
for (i = 0; i < sizeof(PROMPT) - 1; i++)
(void) putc(' ', stderr);
for (i = 0; i < token[t_num].start_index; i++) {
(void) putc((input_line[i] == '\t') ? '\t' : ' ', stderr);
}
(void) putc('^', stderr);
(void) putc('\n', stderr);
}
for (i = 0; i < sizeof(PROMPT) - 1; i++)
(void) putc(' ', stderr);
if (!interactive) {
if (infile_name != NULL)
fprintf(stderr, "\"%s\", line %d: ", infile_name, inline_num);
else
fprintf(stderr, "line %d: ", inline_num);
}
fprintf(stderr, "warning: %s\n", str);
} /* int_warn */
/* Lower-case the given string (DFK) */
/* Done in place. */
void lower_case(s)
char *s;
{
register char *p = s;
while (*p != NUL) {
if (isupper((int)*p))
*p = tolower(*p);
p++;
}
}
/* Squash spaces in the given string (DFK) */
/* That is, reduce all multiple white-space chars to single spaces */
/* Done in place. */
void squash_spaces(s)
char *s;
{
register char *r = s; /* reading point */
register char *w = s; /* writing point */
TBOOLEAN space = FALSE; /* TRUE if we've already copied a space */
for (w = r = s; *r != NUL; r++) {
if (isspace((int)*r)) {
/* white space; only copy if we haven't just copied a space */
if (!space) {
space = TRUE;
*w++ = ' ';
} /* else ignore multiple spaces */
} else {
/* non-space character; copy it and clear flag */
*w++ = *r;
space = FALSE;
}
}
*w = NUL; /* null terminate string */
}
static void parse_esc(instr)
char *instr;
{
char *s = instr, *t = instr;
/* the string will always get shorter, so we can do the
* conversion in situ
*/
while (*s != NUL) {
if (*s == '\\') {
s++;
if (*s == '\\') {
*t++ = '\\';
s++;
} else if (*s == 'n') {
*t++ = '\n';
s++;
} else if (*s == 'r') {
*t++ = '\r';
s++;
} else if (*s == 't') {
*t++ = '\t';
s++;
} else if (*s == '\"') {
*t++ = '\"';
s++;
} else if (*s >= '0' && *s <= '7') {
int i, n;
if (sscanf(s, "%o%n", &i, &n) > 0) {
*t++ = i;
s += n;
} else {
/* int_error("illegal octal number ", c_token); */
*t++ = '\\';
*t++ = *s++;
}
}
} else {
*t++ = *s++;
}
}
*t = NUL;
}