1 #include "cache.h"
3 void strbuf_init(struct strbuf *sb, size_t hint)
4 {
5 memset(sb, 0, sizeof(*sb));
6 if (hint)
7 strbuf_grow(sb, hint);
8 }
10 void strbuf_release(struct strbuf *sb)
11 {
12 free(sb->buf);
13 memset(sb, 0, sizeof(*sb));
14 }
16 void strbuf_reset(struct strbuf *sb)
17 {
18 if (sb->len)
19 strbuf_setlen(sb, 0);
20 }
22 char *strbuf_detach(struct strbuf *sb)
23 {
24 char *res = sb->buf;
25 strbuf_init(sb, 0);
26 return res;
27 }
29 void 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 }
39 void 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 }
46 void 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 }
53 int strbuf_cmp(struct strbuf *a, struct strbuf *b)
54 {
55 int cmp;
56 if (a->len < b->len) {
57 cmp = memcmp(a->buf, b->buf, a->len);
58 return cmp ? cmp : -1;
59 } else {
60 cmp = memcmp(a->buf, b->buf, b->len);
61 return cmp ? cmp : a->len != b->len;
62 }
63 }
65 void strbuf_splice(struct strbuf *sb, size_t pos, size_t len,
66 const void *data, size_t dlen)
67 {
68 if (pos + len < pos)
69 die("you want to use way too much memory");
70 if (pos > sb->len)
71 die("`pos' is too far after the end of the buffer");
72 if (pos + len > sb->len)
73 die("`pos + len' is too far after the end of the buffer");
75 if (dlen >= len)
76 strbuf_grow(sb, dlen - len);
77 memmove(sb->buf + pos + dlen,
78 sb->buf + pos + len,
79 sb->len - pos - len);
80 memcpy(sb->buf + pos, data, dlen);
81 strbuf_setlen(sb, sb->len + dlen - len);
82 }
84 void strbuf_insert(struct strbuf *sb, size_t pos, const void *data, size_t len)
85 {
86 strbuf_splice(sb, pos, 0, data, len);
87 }
89 void strbuf_remove(struct strbuf *sb, size_t pos, size_t len)
90 {
91 strbuf_splice(sb, pos, len, NULL, 0);
92 }
94 void strbuf_add(struct strbuf *sb, const void *data, size_t len)
95 {
96 strbuf_grow(sb, len);
97 memcpy(sb->buf + sb->len, data, len);
98 strbuf_setlen(sb, sb->len + len);
99 }
101 void strbuf_addf(struct strbuf *sb, const char *fmt, ...)
102 {
103 int len;
104 va_list ap;
106 va_start(ap, fmt);
107 len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap);
108 va_end(ap);
109 if (len < 0) {
110 len = 0;
111 }
112 if (len > strbuf_avail(sb)) {
113 strbuf_grow(sb, len);
114 va_start(ap, fmt);
115 len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap);
116 va_end(ap);
117 if (len > strbuf_avail(sb)) {
118 die("this should not happen, your snprintf is broken");
119 }
120 }
121 strbuf_setlen(sb, sb->len + len);
122 }
124 size_t strbuf_fread(struct strbuf *sb, size_t size, FILE *f)
125 {
126 size_t res;
128 strbuf_grow(sb, size);
129 res = fread(sb->buf + sb->len, 1, size, f);
130 if (res > 0) {
131 strbuf_setlen(sb, sb->len + res);
132 }
133 return res;
134 }
136 ssize_t strbuf_read(struct strbuf *sb, int fd, size_t hint)
137 {
138 size_t oldlen = sb->len;
140 strbuf_grow(sb, hint ? hint : 8192);
141 for (;;) {
142 ssize_t cnt;
144 cnt = xread(fd, sb->buf + sb->len, sb->alloc - sb->len - 1);
145 if (cnt < 0) {
146 strbuf_setlen(sb, oldlen);
147 return -1;
148 }
149 if (!cnt)
150 break;
151 sb->len += cnt;
152 strbuf_grow(sb, 8192);
153 }
155 sb->buf[sb->len] = '\0';
156 return sb->len - oldlen;
157 }
159 int strbuf_getline(struct strbuf *sb, FILE *fp, int term)
160 {
161 int ch;
163 strbuf_grow(sb, 0);
164 if (feof(fp))
165 return EOF;
167 strbuf_reset(sb);
168 while ((ch = fgetc(fp)) != EOF) {
169 if (ch == term)
170 break;
171 strbuf_grow(sb, 1);
172 sb->buf[sb->len++] = ch;
173 }
174 if (ch == EOF && sb->len == 0)
175 return EOF;
177 sb->buf[sb->len] = '\0';
178 return 0;
179 }
181 int strbuf_read_file(struct strbuf *sb, const char *path)
182 {
183 int fd, len;
185 fd = open(path, O_RDONLY);
186 if (fd < 0)
187 return -1;
188 len = strbuf_read(sb, fd, 0);
189 close(fd);
190 if (len < 0)
191 return -1;
193 return len;
194 }