summaryrefslogtreecommitdiff
path: root/strbuf.c
blob: 4aed75265e945d7b8dfafb36913006376768b4d3 (plain)
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
#include "cache.h"
 
int prefixcmp(const char *str, const char *prefix)
{
	for (; ; str++, prefix++)
		if (!*prefix)
			return 0;
		else if (*str != *prefix)
			return (unsigned char)*prefix - (unsigned char)*str;
}
 
/*
 * Used as the default ->buf value, so that people can always assume
 * buf is non NULL and ->buf is NUL terminated even for a freshly
 * initialized strbuf.
 */
char strbuf_slopbuf[1];
 
void strbuf_init(struct strbuf *sb, size_t hint)
{
	sb->alloc = sb->len = 0;
	sb->buf = strbuf_slopbuf;
	if (hint)
		strbuf_grow(sb, hint);
}
 
void strbuf_release(struct strbuf *sb)
{
	if (sb->alloc) {
		free(sb->buf);
		strbuf_init(sb, 0);
	}
}
 
char *strbuf_detach(struct strbuf *sb, size_t *sz)
{
	char *res = sb->alloc ? sb->buf : NULL;
	if (sz)
		*sz = sb->len;
	strbuf_init(sb, 0);
	return res;
}
 
void strbuf_attach(struct strbuf *sb, void *buf, size_t len, size_t alloc)
{
	strbuf_release(sb);
	sb->buf   = buf;
	sb->len   = len;
	sb->alloc = alloc;
	strbuf_grow(sb, 0);
	sb->buf[sb->len] = '\0';
}
 
void strbuf_grow(struct strbuf *sb, size_t extra)
{
	if (sb->len + extra + 1 <= sb->len)
		die("you want to use way too much memory");
	if (!sb->alloc)
		sb->buf = NULL;
	ALLOC_GROW(sb->buf, sb->len + extra + 1, sb->alloc);
}
 
void strbuf_rtrim(struct strbuf *sb)
{
	while (sb->len > 0 && isspace((unsigned char)sb->buf[sb->len - 1]))
		sb->len--;
	sb->buf[sb->len] = '\0';
}
 
int strbuf_cmp(struct strbuf *a, struct strbuf *b)
{
	int cmp;
	if (a->len < b->len) {
		cmp = memcmp(a->buf, b->buf, a->len);
		return cmp ? cmp : -1;
	} else {
		cmp = memcmp(a->buf, b->buf, b->len);
		return cmp ? cmp : a->len != b->len;
	}
}
 
void strbuf_splice(struct strbuf *sb, size_t pos, size_t len,
				   const void *data, size_t dlen)
{
	if (pos + len < pos)
		die("you want to use way too much memory");
	if (pos > sb->len)
		die("`pos' is too far after the end of the buffer");
	if (pos + len > sb->len)
		die("`pos + len' is too far after the end of the buffer");
 
	if (dlen >= len)
		strbuf_grow(sb, dlen - len);
	memmove(sb->buf + pos + dlen,
			sb->buf + pos + len,
			sb->len - pos - len);
	memcpy(sb->buf + pos, data, dlen);
	strbuf_setlen(sb, sb->len + dlen - len);
}
 
void strbuf_insert(struct strbuf *sb, size_t pos, const void *data, size_t len)
{
	strbuf_splice(sb, pos, 0, data, len);
}
 
void strbuf_remove(struct strbuf *sb, size_t pos, size_t len)
{
	strbuf_splice(sb, pos, len, NULL, 0);
}
 
void strbuf_add(struct strbuf *sb, const void *data, size_t len)
{
	strbuf_grow(sb, len);
	memcpy(sb->buf + sb->len, data, len);
	strbuf_setlen(sb, sb->len + len);
}
 
void strbuf_adddup(struct strbuf *sb, size_t pos, size_t len)
{
	strbuf_grow(sb, len);
	memcpy(sb->buf + sb->len, sb->buf + pos, len);
	strbuf_setlen(sb, sb->len + len);
}
 
void strbuf_addf(struct strbuf *sb, const char *fmt, ...)
{
	int len;
	va_list ap;
 
	if (!strbuf_avail(sb))
		strbuf_grow(sb, 64);
	va_start(ap, fmt);
	len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap);
	va_end(ap);
	if (len < 0)
		die("your vsnprintf is broken");
	if (len > strbuf_avail(sb)) {
		strbuf_grow(sb, len);
		va_start(ap, fmt);
		len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap);
		va_end(ap);
		if (len > strbuf_avail(sb)) {
			die("this should not happen, your snprintf is broken");
		}
	}
	strbuf_setlen(sb, sb->len + len);
}
 
void strbuf_expand(struct strbuf *sb, const char *format, expand_fn_t fn,
		   void *context)
{
	for (;;) {
		const char *percent;
		size_t consumed;
 
		percent = strchrnul(format, '%');
		strbuf_add(sb, format, percent - format);
		if (!*percent)
			break;
		format = percent + 1;
 
		consumed = fn(sb, format, context);
		if (consumed)
			format += consumed;
		else
			strbuf_addch(sb, '%');
	}
}
 
size_t strbuf_fread(struct strbuf *sb, size_t size, FILE *f)
{
	size_t res;
 
	strbuf_grow(sb, size);
	res = fread(sb->buf + sb->len, 1, size, f);
	if (res > 0) {
		strbuf_setlen(sb, sb->len + res);
	}
	return res;
}
 
ssize_t strbuf_read(struct strbuf *sb, int fd, size_t hint)
{
	size_t oldlen = sb->len;
 
	strbuf_grow(sb, hint ? hint : 8192);
	for (;;) {
		ssize_t cnt;
 
		cnt = xread(fd, sb->buf + sb->len, sb->alloc - sb->len - 1);
		if (cnt < 0) {
			strbuf_setlen(sb, oldlen);
			return -1;
		}
		if (!cnt)
			break;
		sb->len += cnt;
		strbuf_grow(sb, 8192);
	}
 
	sb->buf[sb->len] = '\0';
	return sb->len - oldlen;
}
 
int strbuf_getline(struct strbuf *sb, FILE *fp, int term)
{
	int ch;
 
	strbuf_grow(sb, 0);
	if (feof(fp))
		return EOF;
 
	strbuf_reset(sb);
	while ((ch = fgetc(fp)) != EOF) {
		if (ch == term)
			break;
		strbuf_grow(sb, 1);
		sb->buf[sb->len++] = ch;
	}
	if (ch == EOF && sb->len == 0)
		return EOF;
 
	sb->buf[sb->len] = '\0';
	return 0;
}
 
int strbuf_read_file(struct strbuf *sb, const char *path, size_t hint)
{
	int fd, len;
 
	fd = open(path, O_RDONLY);
	if (fd < 0)
		return -1;
	len = strbuf_read(sb, fd, hint);
	close(fd);
	if (len < 0)
		return -1;
 
	return len;
}