1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
|
/* colorname.c - colorname routines, not dependent on Netpbm formats
**
** Taken from libppm4.c May 2002.
** Copyright (C) 1989 by Jef Poskanzer.
**
** Permission to use, copy, modify, and distribute this software and its
** documentation for any purpose and 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. This software is provided "as is" without express or
** implied warranty.
*/
#define _BSD_SOURCE 1 /* Make sure strdup() is in string.h */
#define _XOPEN_SOURCE 600 /* Make sure strdup() is in string.h */
#include "pm_c_util.h"
#include <ctype.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include "nstring.h"
#include "colorname.h"
static int lineNo;
void
pm_canonstr(char * const arg) {
/*----------------------------------------------------------------------------
Modify string 'arg' to canonical form: lower case, no white space.
-----------------------------------------------------------------------------*/
const char * srcCursor;
char * dstCursor;
for (srcCursor = arg, dstCursor = arg; *srcCursor; ++srcCursor) {
if (!ISSPACE(*srcCursor)) {
*dstCursor++ =
ISUPPER(*srcCursor) ? tolower(*srcCursor) : *srcCursor;
}
}
}
static void
openColornameFileSearch(const char * const searchPath,
FILE ** const filePP) {
/*----------------------------------------------------------------------------
Open the color name file, finding it via the search path 'searchPath'.
Return as *filePP the stream handle for it, but if we don't find it
(or just can open it) anywhere, return *filePP == NULL.
-----------------------------------------------------------------------------*/
char * buffer;
buffer = strdup(searchPath);
if (buffer) {
char * cursor;
bool eol;
cursor = &buffer[0];
eol = FALSE; /* initial value */
*filePP = NULL; /* initial value */
while (!eol && !*filePP) {
const char * token;
token = pm_strsep(&cursor, ":");
if (token) {
*filePP = fopen(token, "r");
} else
eol = TRUE;
}
free(buffer);
} else
*filePP = NULL;
}
FILE *
pm_openColornameFile(const char * const fileName, const int must_open) {
/*----------------------------------------------------------------------------
Open the colorname dictionary file. Its file name is 'fileName', unless
'fileName' is NULL. In that case, its file name is the value of the
environment variable whose name is RGB_ENV (e.g. "RGBDEF"). Except
if that environment variable is not set, it is RGB_DB1, RGB_DB2,
or RGB_DB3 (e.g. "/usr/lib/X11/rgb.txt"), whichever exists.
'must_open' is a logical: we must get the file open or die. If
'must_open' is true and we can't open the file (e.g. it doesn't
exist), exit the program with an error message. If 'must_open' is
false and we can't open the file, just return a null pointer.
-----------------------------------------------------------------------------*/
FILE *f;
if (fileName == NULL) {
const char * rgbdef = getenv(RGBENV);
if (rgbdef) {
/* The environment variable is set */
f = fopen(rgbdef, "r");
if (f == NULL && must_open)
pm_error("Can't open the color names dictionary file "
"named %s, per the %s environment variable. "
"errno = %d (%s)",
rgbdef, RGBENV, errno, strerror(errno));
} else {
/* The environment variable isn't set, so try the hardcoded
default color name dictionary locations.
*/
openColornameFileSearch(RGB_DB_PATH, &f);
if (f == NULL && must_open) {
pm_error("can't open color names dictionary file from the "
"path '%s' "
"and Environment variable %s not set. Set %s to "
"the pathname of your rgb.txt file or don't use "
"color names.",
RGB_DB_PATH, RGBENV, RGBENV);
}
}
} else {
f = fopen(fileName, "r");
if (f == NULL && must_open)
pm_error("Can't open the color names dictionary file '%s'. "
"errno = %d (%s)", fileName, errno, strerror(errno));
}
lineNo = 0;
return(f);
}
struct colorfile_entry
pm_colorget(FILE * const f) {
/*----------------------------------------------------------------------------
Get next color entry from the color name dictionary file 'f'.
If eof or error, return a color entry with NULL for the color name.
Otherwise, return color name in static storage within.
-----------------------------------------------------------------------------*/
char buf[200];
static char colorname[200];
bool gotOne;
bool eof;
struct colorfile_entry retval;
char * rc;
gotOne = FALSE; /* initial value */
eof = FALSE;
while (!gotOne && !eof) {
lineNo++;
rc = fgets(buf, sizeof(buf), f);
if (rc == NULL)
eof = TRUE;
else {
if (buf[0] != '#' && buf[0] != '\n' && buf[0] != '!' &&
buf[0] != '\0') {
if (sscanf(buf, "%ld %ld %ld %[^\n]",
&retval.r, &retval.g, &retval.b, colorname)
== 4 )
gotOne = TRUE;
else {
if (buf[strlen(buf)-1] == '\n')
buf[strlen(buf)-1] = '\0';
pm_message("can't parse color names dictionary Line %d: "
"'%s'",
lineNo, buf);
}
}
}
}
if (gotOne)
retval.colorname = colorname;
else
retval.colorname = NULL;
return retval;
}
void
pm_parse_dictionary_name(char const colorname[],
pixval const maxval,
int const closeOk,
pixel * const colorP) {
FILE* f;
bool gotit;
bool colorfileExhausted;
struct colorfile_entry colorfile_entry;
char * canoncolor;
pixval r,g,b;
f = pm_openColornameFile(NULL, TRUE); /* exits if error */
canoncolor = strdup(colorname);
pm_canonstr(canoncolor);
gotit = FALSE;
colorfileExhausted = FALSE;
while (!gotit && !colorfileExhausted) {
colorfile_entry = pm_colorget(f);
if (colorfile_entry.colorname) {
pm_canonstr(colorfile_entry.colorname);
if (strcmp( canoncolor, colorfile_entry.colorname) == 0)
gotit = TRUE;
} else
colorfileExhausted = TRUE;
}
fclose(f);
if (!gotit)
pm_error("unknown color '%s'", colorname);
/* Rescale from [0..255] if necessary. */
if (maxval != 255) {
r = colorfile_entry.r * maxval / 255;
g = colorfile_entry.g * maxval / 255;
b = colorfile_entry.b * maxval / 255;
if (!closeOk) {
if (r * 255 / maxval != colorfile_entry.r ||
g * 255 / maxval != colorfile_entry.g ||
b * 255 / maxval != colorfile_entry.b)
pm_message("WARNING: color '%s' cannot be represented "
"exactly with a maxval of %u. "
"Approximating as (%u,%u,%u). "
"The color dictionary uses maxval 255, so that "
"maxval will always work.",
colorname, maxval, r, g, b);
}
} else {
r = colorfile_entry.r;
g = colorfile_entry.g;
b = colorfile_entry.b;
}
free(canoncolor);
PPM_ASSIGN(*colorP, r, g, b);
}
|
