The R Project SVN – R – Diff – /branches/djm-source/src/gnuwin32/graphapp/strings.c


/*
 * GraphApp - Cross-Platform Graphics Programming Library.
 *
 * File: strings.c -- local string functions.
 * Platform: Windows  Version: 2.44  Date: 1998/09/09
 *
 * Version: 1.00  Changes: Original version by Lachlan Patrick.
 * Version: 2.00  Changes: Added del_string.
 * Version: 2.30  Changes: Now uses array(), not malloc().
 * Version: 2.44  Changes: Now uses array() instead of static char[].
 */
 
/* Copyright (C) 1993-1998 Lachlan Patrick
 
   This file is part of GraphApp, a cross-platform C graphics library.
 
   GraphApp is free software; you can redistribute it and/or modify it
   under the terms of the GNU Library General Public License.
   GraphApp is distributed in the hope that it will be useful, but
   WITHOUT ANY WARRANTY.
 
   See the file COPYLIB.TXT for details.
*/
 
#include "internal.h"
 
/*
 *  Create and return a newly allocated copy of a string.
 *  Null strings are converted into empty strings first.
 */
char *new_string(char *src)
{
	char *str;
	if (! src)
		src = "";
	str = array (string_length(src), char);
	if (str)
		copy_string(str, src);
	return str;
}
 
void del_string(char *str)
{
	discard(str);
}
 
/*
 *  String length function.
 *  If the string is null, the length is defined to be zero.
 */
long string_length(char *s)
{
	long len = 0;
	if (s)
		while (s[len])
			len++;
	return len;
}
 
/*
 *  Copy a string.
 *  Same as strcpy except it avoids doing anything to null strings.
 */
void copy_string(char *dest, char *src)
{
	int len;
	if ((dest) && (src)) {
		for (len=0; src[len]; len++)
			dest[len] = src[len];
		dest[len] = '\0';
	}
}
 
/*
 *  String comparison function.
 *  Null == null, null == "", "" == null, otherwise same as strcmp.
 */
int compare_strings(char *s1, char *s2)
{
	int len, diff;
 
	if (s1 == s2)
		return 0;
	else if (s1 == NULL) { /* s2 cannot be null since s1 != s2 */
		if (s2[0] == '\0')
			return 0;
		return -1;
	}
	else if (s2 == NULL) { /* s1 is not null */
		if (s1[0] == '\0')
			return 0;
		return +1;
	}
	else {
		for (len=0; s1[len] || s2[len]; len++) {
			diff = s1[len] - s2[len];
			if (diff)
				return diff;
		}
		return 0;
	}
}
 
/*
 *  Append one string to another, and return the result.
 *  This function correctly handles the situation where one or both
 *  of the parameters are temporary strings returned by an earlier
 *  call to this function.
 */
char *add_strings(char *s1, char *s2)
{
	static char *buffer = NULL;
	char *prev;
	int len1, len2;
 
	prev = buffer;
 
	if (! s1)
		return s2;
	else if (! s2)
		return s1;
 
	len1 = string_length(s1);
	len2 = string_length(s2);
 
	buffer = array (len1+len2, char);
 
	if (buffer != NULL) {
		copy_string(buffer, s1);
		copy_string(buffer+len1, s2);
	}
 
	if (prev)
		discard(prev); /* free previous string buffer */
 
	return buffer;
}
 
/*
 *  Convert a char to a string, return the result in a static buffer.
 */
char *char_to_string(char ch)
{
	static char str[2];
	str[0] = ch;
	str[1] = '\0';
	return str;
}
 
/*
 *  Convert an integer to a string, return the result in a static buffer.
 */
char *int_to_string(long i)
{
	static char *str = NULL;
	if (str == NULL)
		str = array(40,char);
	sprintf(str, "%ld", i);
	return str;
}
 
/*
 *  Convert a floating point number to a string,
 *  return the result in a static buffer.
 */
char *float_to_string(float f)
{
	static char *str = NULL;
	if (str == NULL)
		str = array(40,char);
	sprintf(str, "%g", f);
	return str;
}
 
/*
 *  Case-insensitive string comparison function.
 */
PROTECTED
int string_diff(char *s, char *t)
{
	int ch1, ch2;
	int diff = 0;
 
	while ((diff == 0) && ((*s != '\0') || (*t != '\0')))
	{
		ch1 = *s; ch2 = *t;
		if ((ch1 >= 'A') && (ch1 <= 'Z'))
			ch1 = ch1 - 'A' + 'a';
		if ((ch2 >= 'A') && (ch2 <= 'Z'))
			ch2 = ch2 - 'A' + 'a';
		diff = (ch1 - ch2);
		s++; t++;
	}
 
	return diff;
}
 
/*
 *  Produce a new string which has CR-LF instead of just '\n'
 *  to mark end of line. The returned string must later be freed.
 */
PROTECTED
char *to_dos_string(char *text)
{
	char *s;
	char *newstr;
	char prev;
	long length = 0;
 
	if (!text)
		return text;
	prev = '\0';
	for (s = text; *s != '\0'; s++) {
		length++;
		if ((*s == '\n') && (prev != '\r'))
			length++;
		prev = *s;
	}
 
	newstr = array (length, char);
 
	prev = '\0';
	for (s = newstr; *text != '\0'; s++, text++) {
		if ((*text == '\n') && (prev != '\r')) {
			*s = '\r';
			s++;
		}
		*s = *text;
		prev = *s;
	}
	*s = '\0';
 
	return newstr;
}
 
/*
 *  Strip carriage returns from a string. The resulting
 *  string must later be freed.
 */
PROTECTED
char *to_c_string(char *text)
{
	char *s;
	char *newstr;
	long length = 0;
 
	if (!text)
		return text;
	for (s = text; *s != '\0'; s++) {
		length++;
		if ((*s == '\r') && (*(s+1) == '\n'))
			length--;
	}
 
	newstr = array (length, char);
 
	for (s = newstr; *text != '\0'; s++, text++) {
		if ((*text == '\r') && (*(text+1) == '\n'))
			text++;
		*s = *text;
	}
	*s = '\0';
 
	return newstr;
}

Rev 4394	Rev 29864
1	`/*`	1	`/*`
2	`* GraphApp - Cross-Platform Graphics Programming Library.`	2	`* GraphApp - Cross-Platform Graphics Programming Library.`
3	`*`	3	`*`
4	`* File: strings.c -- local string functions.`	4	`* File: strings.c -- local string functions.`
5	`* Platform: Windows Version: 2.44 Date: 1998/09/09`	5	`* Platform: Windows Version: 2.44 Date: 1998/09/09`
6	`*`	6	`*`
7	`* Version: 1.00 Changes: Original version by Lachlan Patrick.`	7	`* Version: 1.00 Changes: Original version by Lachlan Patrick.`
8	`* Version: 2.00 Changes: Added del_string.`	8	`* Version: 2.00 Changes: Added del_string.`
9	`* Version: 2.30 Changes: Now uses array(), not malloc().`	9	`* Version: 2.30 Changes: Now uses array(), not malloc().`
10	`* Version: 2.44 Changes: Now uses array() instead of static char[].`	10	`* Version: 2.44 Changes: Now uses array() instead of static char[].`
11	`*/`	11	`*/`
12		12
13	`/* Copyright (C) 1993-1998 Lachlan Patrick`	13	`/* Copyright (C) 1993-1998 Lachlan Patrick`
14		14
15	`This file is part of GraphApp, a cross-platform C graphics library.`	15	`This file is part of GraphApp, a cross-platform C graphics library.`
16		16
17	`GraphApp is free software; you can redistribute it and/or modify it`	17	`GraphApp is free software; you can redistribute it and/or modify it`
18	`under the terms of the GNU Library General Public License.`	18	`under the terms of the GNU Library General Public License.`
19	`GraphApp is distributed in the hope that it will be useful, but`	19	`GraphApp is distributed in the hope that it will be useful, but`
20	`WITHOUT ANY WARRANTY.`	20	`WITHOUT ANY WARRANTY.`
21		21
22	`See the file COPYLIB.TXT for details.`	22	`See the file COPYLIB.TXT for details.`
23	`*/`	23	`*/`
24		24
25	`#include "internal.h"`	25	`#include "internal.h"`
26		26
27	`/*`	27	`/*`
28	`* Create and return a newly allocated copy of a string.`	28	`* Create and return a newly allocated copy of a string.`
29	`* Null strings are converted into empty strings first.`	29	`* Null strings are converted into empty strings first.`
30	`*/`	30	`*/`
31	`char new_string(char src)`	31	`char new_string(char src)`
32	`{`	32	`{`
33	`char *str;`	33	`char *str;`
34	`if (! src)`	34	`if (! src)`
35	`src = "";`	35	`src = "";`
36	`str = array (string_length(src), char);`	36	`str = array (string_length(src), char);`
37	`if (str)`	37	`if (str)`
38	`copy_string(str, src);`	38	`copy_string(str, src);`
39	`return str;`	39	`return str;`
40	`}`	40	`}`
41		41
42	`void del_string(char *str)`	42	`void del_string(char *str)`
43	`{`	43	`{`
44	`discard(str);`	44	`discard(str);`
45	`}`	45	`}`
46		46
47	`/*`	47	`/*`
48	`* String length function.`	48	`* String length function.`
49	`* If the string is null, the length is defined to be zero.`	49	`* If the string is null, the length is defined to be zero.`
50	`*/`	50	`*/`
51	`long string_length(char *s)`	51	`long string_length(char *s)`
52	`{`	52	`{`
53	`long len = 0;`	53	`long len = 0;`
54	`if (s)`	54	`if (s)`
55	`while (s[len])`	55	`while (s[len])`
56	`len++;`	56	`len++;`
57	`return len;`	57	`return len;`
58	`}`	58	`}`
59		59
60	`/*`	60	`/*`
61	`* Copy a string.`	61	`* Copy a string.`
62	`* Same as strcpy except it avoids doing anything to null strings.`	62	`* Same as strcpy except it avoids doing anything to null strings.`
63	`*/`	63	`*/`
64	`void copy_string(char dest, char src)`	64	`void copy_string(char dest, char src)`
65	`{`	65	`{`
66	`int len;`	66	`int len;`
67	`if ((dest) && (src)) {`	67	`if ((dest) && (src)) {`
68	`for (len=0; src[len]; len++)`	68	`for (len=0; src[len]; len++)`
69	`dest[len] = src[len];`	69	`dest[len] = src[len];`
70	`dest[len] = '\0';`	70	`dest[len] = '\0';`
71	`}`	71	`}`
72	`}`	72	`}`
73		73
74	`/*`	74	`/*`
75	`* String comparison function.`	75	`* String comparison function.`
76	`* Null == null, null == "", "" == null, otherwise same as strcmp.`	76	`* Null == null, null == "", "" == null, otherwise same as strcmp.`
77	`*/`	77	`*/`
78	`int compare_strings(char s1, char s2)`	78	`int compare_strings(char s1, char s2)`
79	`{`	79	`{`
80	`int len, diff;`	80	`int len, diff;`
81		81
82	`if (s1 == s2)`	82	`if (s1 == s2)`
83	`return 0;`	83	`return 0;`
84	`else if (s1 == NULL) { /* s2 cannot be null since s1 != s2 */`	84	`else if (s1 == NULL) { /* s2 cannot be null since s1 != s2 */`
85	`if (s2[0] == '\0')`	85	`if (s2[0] == '\0')`
86	`return 0;`	86	`return 0;`
87	`return -1;`	87	`return -1;`
88	`}`	88	`}`
89	`else if (s2 == NULL) { /* s1 is not null */`	89	`else if (s2 == NULL) { /* s1 is not null */`
90	`if (s1[0] == '\0')`	90	`if (s1[0] == '\0')`
91	`return 0;`	91	`return 0;`
92	`return +1;`	92	`return +1;`
93	`}`	93	`}`
94	`else {`	94	`else {`
95	`for (len=0; s1[len] \|\| s2[len]; len++) {`	95	`for (len=0; s1[len] \|\| s2[len]; len++) {`
96	`diff = s1[len] - s2[len];`	96	`diff = s1[len] - s2[len];`
97	`if (diff)`	97	`if (diff)`
98	`return diff;`	98	`return diff;`
99	`}`	99	`}`
100	`return 0;`	100	`return 0;`
101	`}`	101	`}`
102	`}`	102	`}`
103		103
104	`/*`	104	`/*`
105	`* Append one string to another, and return the result.`	105	`* Append one string to another, and return the result.`
106	`* This function correctly handles the situation where one or both`	106	`* This function correctly handles the situation where one or both`
107	`* of the parameters are temporary strings returned by an earlier`	107	`* of the parameters are temporary strings returned by an earlier`
108	`* call to this function.`	108	`* call to this function.`
109	`*/`	109	`*/`
110	`char add_strings(char s1, char *s2)`	110	`char add_strings(char s1, char *s2)`
111	`{`	111	`{`
112	`static char *buffer = NULL;`	112	`static char *buffer = NULL;`
113	`char *prev;`	113	`char *prev;`
114	`int len1, len2;`	114	`int len1, len2;`
115		115
116	`prev = buffer;`	116	`prev = buffer;`
117		117
118	`if (! s1)`	118	`if (! s1)`
119	`return s2;`	119	`return s2;`
120	`else if (! s2)`	120	`else if (! s2)`
121	`return s1;`	121	`return s1;`
122		122
123	`len1 = string_length(s1);`	123	`len1 = string_length(s1);`
124	`len2 = string_length(s2);`	124	`len2 = string_length(s2);`
125		125
126	`buffer = array (len1+len2, char);`	126	`buffer = array (len1+len2, char);`
127		127
128	`if (buffer != NULL) {`	128	`if (buffer != NULL) {`
129	`copy_string(buffer, s1);`	129	`copy_string(buffer, s1);`
130	`copy_string(buffer+len1, s2);`	130	`copy_string(buffer+len1, s2);`
131	`}`	131	`}`
132		132
133	`if (prev)`	133	`if (prev)`
134	`discard(prev); /* free previous string buffer */`	134	`discard(prev); /* free previous string buffer */`
135		135
136	`return buffer;`	136	`return buffer;`
137	`}`	137	`}`
138		138
139	`/*`	139	`/*`
140	`* Convert a char to a string, return the result in a static buffer.`	140	`* Convert a char to a string, return the result in a static buffer.`
141	`*/`	141	`*/`
142	`char *char_to_string(char ch)`	142	`char *char_to_string(char ch)`
143	`{`	143	`{`
144	`static char str[2];`	144	`static char str[2];`
145	`str[0] = ch;`	145	`str[0] = ch;`
146	`str[1] = '\0';`	146	`str[1] = '\0';`
147	`return str;`	147	`return str;`
148	`}`	148	`}`
149		149
150	`/*`	150	`/*`
151	`* Convert an integer to a string, return the result in a static buffer.`	151	`* Convert an integer to a string, return the result in a static buffer.`
152	`*/`	152	`*/`
153	`char *int_to_string(long i)`	153	`char *int_to_string(long i)`
154	`{`	154	`{`
155	`static char *str = NULL;`	155	`static char *str = NULL;`
156	`if (str == NULL)`	156	`if (str == NULL)`
157	`str = array(40,char);`	157	`str = array(40,char);`
158	`sprintf(str, "%ld", i);`	158	`sprintf(str, "%ld", i);`
159	`return str;`	159	`return str;`
160	`}`	160	`}`
161		161
162	`/*`	162	`/*`
163	`* Convert a floating point number to a string,`	163	`* Convert a floating point number to a string,`
164	`* return the result in a static buffer.`	164	`* return the result in a static buffer.`
165	`*/`	165	`*/`
166	`char *float_to_string(float f)`	166	`char *float_to_string(float f)`
167	`{`	167	`{`
168	`static char *str = NULL;`	168	`static char *str = NULL;`
169	`if (str == NULL)`	169	`if (str == NULL)`
170	`str = array(40,char);`	170	`str = array(40,char);`
171	`sprintf(str, "%g", f);`	171	`sprintf(str, "%g", f);`
172	`return str;`	172	`return str;`
173	`}`	173	`}`
174		174
175	`/*`	175	`/*`
176	`* Case-insensitive string comparison function.`	176	`* Case-insensitive string comparison function.`
177	`*/`	177	`*/`
178	`PROTECTED`	178	`PROTECTED`
179	`int string_diff(char s, char t)`	179	`int string_diff(char s, char t)`
180	`{`	180	`{`
181	`int ch1, ch2;`	181	`int ch1, ch2;`
182	`int diff = 0;`	182	`int diff = 0;`
183		183
184	`while ((diff == 0) && ((s != '\0') \|\| (t != '\0')))`	184	`while ((diff == 0) && ((s != '\0') \|\| (t != '\0')))`
185	`{`	185	`{`
186	`ch1 = s; ch2 = t;`	186	`ch1 = s; ch2 = t;`
187	`if ((ch1 >= 'A') && (ch1 <= 'Z'))`	187	`if ((ch1 >= 'A') && (ch1 <= 'Z'))`
188	`ch1 = ch1 - 'A' + 'a';`	188	`ch1 = ch1 - 'A' + 'a';`
189	`if ((ch2 >= 'A') && (ch2 <= 'Z'))`	189	`if ((ch2 >= 'A') && (ch2 <= 'Z'))`
190	`ch2 = ch2 - 'A' + 'a';`	190	`ch2 = ch2 - 'A' + 'a';`
191	`diff = (ch1 - ch2);`	191	`diff = (ch1 - ch2);`
192	`s++; t++;`	192	`s++; t++;`
193	`}`	193	`}`
194		194
195	`return diff;`	195	`return diff;`
196	`}`	196	`}`
197		197
198	`/*`	198	`/*`
199	`* Produce a new string which has CR-LF instead of just '\n'`	199	`* Produce a new string which has CR-LF instead of just '\n'`
200	`* to mark end of line. The returned string must later be freed.`	200	`* to mark end of line. The returned string must later be freed.`
201	`*/`	201	`*/`
202	`PROTECTED`	202	`PROTECTED`
203	`char to_dos_string(char text)`	203	`char to_dos_string(char text)`
204	`{`	204	`{`
205	`char *s;`	205	`char *s;`
206	`char *newstr;`	206	`char *newstr;`
207	`char prev;`	207	`char prev;`
208	`long length = 0;`	208	`long length = 0;`
209		209
210	`if (!text)`	210	`if (!text)`
211	`return text;`	211	`return text;`
212	`prev = '\0';`	212	`prev = '\0';`
213	`for (s = text; *s != '\0'; s++) {`	213	`for (s = text; *s != '\0'; s++) {`
214	`length++;`	214	`length++;`
215	`if ((*s == '\n') && (prev != '\r'))`	215	`if ((*s == '\n') && (prev != '\r'))`
216	`length++;`	216	`length++;`
217	`prev = *s;`	217	`prev = *s;`
218	`}`	218	`}`
219		219
220	`newstr = array (length, char);`	220	`newstr = array (length, char);`
221		221
222	`prev = '\0';`	222	`prev = '\0';`
223	`for (s = newstr; *text != '\0'; s++, text++) {`	223	`for (s = newstr; *text != '\0'; s++, text++) {`
224	`if ((*text == '\n') && (prev != '\r')) {`	224	`if ((*text == '\n') && (prev != '\r')) {`
225	`*s = '\r';`	225	`*s = '\r';`
226	`s++;`	226	`s++;`
227	`}`	227	`}`
228	`s = text;`	228	`s = text;`
229	`prev = *s;`	229	`prev = *s;`
230	`}`	230	`}`
231	`*s = '\0';`	231	`*s = '\0';`
232		232
233	`return newstr;`	233	`return newstr;`
234	`}`	234	`}`
235		235
236	`/*`	236	`/*`
237	`* Strip carriage returns from a string. The resulting`	237	`* Strip carriage returns from a string. The resulting`
238	`* string must later be freed.`	238	`* string must later be freed.`
239	`*/`	239	`*/`
240	`PROTECTED`	240	`PROTECTED`
241	`char to_c_string(char text)`	241	`char to_c_string(char text)`
242	`{`	242	`{`
243	`char *s;`	243	`char *s;`
244	`char *newstr;`	244	`char *newstr;`
245	`long length = 0;`	245	`long length = 0;`
246		246
247	`if (!text)`	247	`if (!text)`
248	`return text;`	248	`return text;`
249	`for (s = text; *s != '\0'; s++) {`	249	`for (s = text; *s != '\0'; s++) {`
250	`length++;`	250	`length++;`
251	`if ((s == '\r') && ((s+1) == '\n'))`	251	`if ((s == '\r') && ((s+1) == '\n'))`
252	`length--;`	252	`length--;`
253	`}`	253	`}`
254		254
255	`newstr = array (length, char);`	255	`newstr = array (length, char);`
256		256
257	`for (s = newstr; *text != '\0'; s++, text++) {`	257	`for (s = newstr; *text != '\0'; s++, text++) {`
258	`if ((text == '\r') && ((text+1) == '\n'))`	258	`if ((text == '\r') && ((text+1) == '\n'))`
259	`text++;`	259	`text++;`
260	`s = text;`	260	`s = text;`
261	`}`	261	`}`
262	`*s = '\0';`	262	`*s = '\0';`
263		263
264	`return newstr;`	264	`return newstr;`
265	`}`	265	`}`

The R Project SVN R

(root)/branches/djm-source/src/gnuwin32/graphapp/strings.c @ 34412 – Rev 4394 → 29864