Drop strbuf's 'eof' marker, and make read_line a first class citizen.
[git/git.git] / strbuf.c
1 #include "cache.h"
2
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 }
9
10 void strbuf_release(struct strbuf *sb)
11 {
12 free(sb->buf);
13 memset(sb, 0, sizeof(*sb));
14 }
15
16 void strbuf_reset(struct strbuf *sb)
17 {
18 if (sb->len)
19 strbuf_setlen(sb, 0);
20 }
21
22 char *strbuf_detach(struct strbuf *sb)
23 {
24 char *res = sb->buf;
25 strbuf_init(sb, 0);
26 return res;
27 }
28
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 }
38
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 }
45
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 }
52
53 void strbuf_insert(struct strbuf *sb, size_t pos, const void *data, size_t len)
54 {
55 strbuf_grow(sb, len);
56 if (pos > sb->len)
57 die("`pos' is too far after the end of the buffer");
58 memmove(sb->buf + pos + len, sb->buf + pos, sb->len - pos);
59 memcpy(sb->buf + pos, data, len);
60 strbuf_setlen(sb, sb->len + len);
61 }
62
63 void strbuf_splice(struct strbuf *sb, size_t pos, size_t len,
64 const void *data, size_t dlen)
65 {
66 if (pos + len < pos)
67 die("you want to use way too much memory");
68 if (pos > sb->len)
69 die("`pos' is too far after the end of the buffer");
70 if (pos + len > sb->len)
71 die("`pos + len' is too far after the end of the buffer");
72
73 if (dlen >= len)
74 strbuf_grow(sb, dlen - len);
75 memmove(sb->buf + pos + dlen,
76 sb->buf + pos + len,
77 sb->len - pos - len);
78 memcpy(sb->buf + pos, data, dlen);
79 strbuf_setlen(sb, sb->len + dlen - len);
80 }
81
82 void 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
89 void 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
112 size_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
124 ssize_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
147 int 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 }