dcb725dcdd2f8edb04502fed425bd3b7a7204ebf
1#include "cache.h"
2
3void strbuf_init(struct strbuf *sb, size_t hint)
4{
5 memset(sb, 0, sizeof(*sb));
6 if (hint)
7 strbuf_grow(sb, hint);
8}
9
10void strbuf_release(struct strbuf *sb)
11{
12 free(sb->buf);
13 memset(sb, 0, sizeof(*sb));
14}
15
16void strbuf_reset(struct strbuf *sb)
17{
18 if (sb->len)
19 strbuf_setlen(sb, 0);
20}
21
22char *strbuf_detach(struct strbuf *sb)
23{
24 char *res = sb->buf;
25 strbuf_init(sb, 0);
26 return res;
27}
28
29void strbuf_attach(struct strbuf *sb, void *buf, size_t len, size_t alloc)
30{
31 strbuf_release(sb);
32 sb->buf = buf;
33 sb->len = len;
34 sb->alloc = alloc;
35 strbuf_grow(sb, 0);
36 sb->buf[sb->len] = '\0';
37}
38
39void strbuf_grow(struct strbuf *sb, size_t extra)
40{
41 if (sb->len + extra + 1 <= sb->len)
42 die("you want to use way too much memory");
43 ALLOC_GROW(sb->buf, sb->len + extra + 1, sb->alloc);
44}
45
46void strbuf_rtrim(struct strbuf *sb)
47{
48 while (sb->len > 0 && isspace((unsigned char)sb->buf[sb->len - 1]))
49 sb->len--;
50 sb->buf[sb->len] = '\0';
51}
52
53void strbuf_splice(struct strbuf *sb, size_t pos, size_t len,
54 const void *data, size_t dlen)
55{
56 if (pos + len < pos)
57 die("you want to use way too much memory");
58 if (pos > sb->len)
59 die("`pos' is too far after the end of the buffer");
60 if (pos + len > sb->len)
61 die("`pos + len' is too far after the end of the buffer");
62
63 if (dlen >= len)
64 strbuf_grow(sb, dlen - len);
65 memmove(sb->buf + pos + dlen,
66 sb->buf + pos + len,
67 sb->len - pos - len);
68 memcpy(sb->buf + pos, data, dlen);
69 strbuf_setlen(sb, sb->len + dlen - len);
70}
71
72void strbuf_insert(struct strbuf *sb, size_t pos, const void *data, size_t len)
73{
74 strbuf_splice(sb, pos, 0, data, len);
75}
76
77void strbuf_remove(struct strbuf *sb, size_t pos, size_t len)
78{
79 strbuf_splice(sb, pos, len, NULL, 0);
80}
81
82void strbuf_add(struct strbuf *sb, const void *data, size_t len)
83{
84 strbuf_grow(sb, len);
85 memcpy(sb->buf + sb->len, data, len);
86 strbuf_setlen(sb, sb->len + len);
87}
88
89void strbuf_addf(struct strbuf *sb, const char *fmt, ...)
90{
91 int len;
92 va_list ap;
93
94 va_start(ap, fmt);
95 len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap);
96 va_end(ap);
97 if (len < 0) {
98 len = 0;
99 }
100 if (len > strbuf_avail(sb)) {
101 strbuf_grow(sb, len);
102 va_start(ap, fmt);
103 len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap);
104 va_end(ap);
105 if (len > strbuf_avail(sb)) {
106 die("this should not happen, your snprintf is broken");
107 }
108 }
109 strbuf_setlen(sb, sb->len + len);
110}
111
112size_t strbuf_fread(struct strbuf *sb, size_t size, FILE *f)
113{
114 size_t res;
115
116 strbuf_grow(sb, size);
117 res = fread(sb->buf + sb->len, 1, size, f);
118 if (res > 0) {
119 strbuf_setlen(sb, sb->len + res);
120 }
121 return res;
122}
123
124ssize_t strbuf_read(struct strbuf *sb, int fd, size_t hint)
125{
126 size_t oldlen = sb->len;
127
128 strbuf_grow(sb, hint ? hint : 8192);
129 for (;;) {
130 ssize_t cnt;
131
132 cnt = xread(fd, sb->buf + sb->len, sb->alloc - sb->len - 1);
133 if (cnt < 0) {
134 strbuf_setlen(sb, oldlen);
135 return -1;
136 }
137 if (!cnt)
138 break;
139 sb->len += cnt;
140 strbuf_grow(sb, 8192);
141 }
142
143 sb->buf[sb->len] = '\0';
144 return sb->len - oldlen;
145}
146
147int strbuf_getline(struct strbuf *sb, FILE *fp, int term)
148{
149 int ch;
150
151 strbuf_grow(sb, 0);
152 if (feof(fp))
153 return EOF;
154
155 strbuf_reset(sb);
156 while ((ch = fgetc(fp)) != EOF) {
157 if (ch == term)
158 break;
159 strbuf_grow(sb, 1);
160 sb->buf[sb->len++] = ch;
161 }
162 if (ch == EOF && sb->len == 0)
163 return EOF;
164
165 sb->buf[sb->len] = '\0';
166 return 0;
167}