Handle broken vsnprintf implementations in strbuf
[git/git.git] / strbuf.c
CommitLineData
812666c8 1#include "cache.h"
d1df5743 2
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3/*
4 * Used as the default ->buf value, so that people can always assume
5 * buf is non NULL and ->buf is NUL terminated even for a freshly
6 * initialized strbuf.
7 */
8char strbuf_slopbuf[1];
9
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10void strbuf_init(struct strbuf *sb, size_t hint)
11{
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12 sb->alloc = sb->len = 0;
13 sb->buf = strbuf_slopbuf;
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14 if (hint)
15 strbuf_grow(sb, hint);
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16}
17
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18void strbuf_release(struct strbuf *sb)
19{
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20 if (sb->alloc) {
21 free(sb->buf);
22 strbuf_init(sb, 0);
23 }
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24}
25
b315c5c0 26char *strbuf_detach(struct strbuf *sb, size_t *sz)
917c9a71 27{
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28 char *res = sb->alloc ? sb->buf : NULL;
29 if (sz)
30 *sz = sb->len;
f1696ee3 31 strbuf_init(sb, 0);
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32 return res;
33}
34
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35void strbuf_attach(struct strbuf *sb, void *buf, size_t len, size_t alloc)
36{
37 strbuf_release(sb);
38 sb->buf = buf;
39 sb->len = len;
40 sb->alloc = alloc;
41 strbuf_grow(sb, 0);
42 sb->buf[sb->len] = '\0';
43}
44
45void strbuf_grow(struct strbuf *sb, size_t extra)
46{
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47 if (sb->len + extra + 1 <= sb->len)
48 die("you want to use way too much memory");
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49 if (!sb->alloc)
50 sb->buf = NULL;
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51 ALLOC_GROW(sb->buf, sb->len + extra + 1, sb->alloc);
52}
53
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54void strbuf_rtrim(struct strbuf *sb)
55{
56 while (sb->len > 0 && isspace((unsigned char)sb->buf[sb->len - 1]))
57 sb->len--;
58 sb->buf[sb->len] = '\0';
59}
60
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61int strbuf_cmp(struct strbuf *a, struct strbuf *b)
62{
63 int cmp;
64 if (a->len < b->len) {
65 cmp = memcmp(a->buf, b->buf, a->len);
66 return cmp ? cmp : -1;
67 } else {
68 cmp = memcmp(a->buf, b->buf, b->len);
69 return cmp ? cmp : a->len != b->len;
70 }
71}
72
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73void strbuf_splice(struct strbuf *sb, size_t pos, size_t len,
74 const void *data, size_t dlen)
75{
76 if (pos + len < pos)
77 die("you want to use way too much memory");
78 if (pos > sb->len)
79 die("`pos' is too far after the end of the buffer");
80 if (pos + len > sb->len)
81 die("`pos + len' is too far after the end of the buffer");
82
83 if (dlen >= len)
84 strbuf_grow(sb, dlen - len);
85 memmove(sb->buf + pos + dlen,
86 sb->buf + pos + len,
87 sb->len - pos - len);
88 memcpy(sb->buf + pos, data, dlen);
89 strbuf_setlen(sb, sb->len + dlen - len);
90}
91
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92void strbuf_insert(struct strbuf *sb, size_t pos, const void *data, size_t len)
93{
94 strbuf_splice(sb, pos, 0, data, len);
95}
96
97void strbuf_remove(struct strbuf *sb, size_t pos, size_t len)
98{
99 strbuf_splice(sb, pos, len, NULL, 0);
100}
101
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102void strbuf_add(struct strbuf *sb, const void *data, size_t len)
103{
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104 strbuf_grow(sb, len);
105 memcpy(sb->buf + sb->len, data, len);
106 strbuf_setlen(sb, sb->len + len);
107}
108
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109void strbuf_addf(struct strbuf *sb, const char *fmt, ...)
110{
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111 int len;
112 va_list ap;
113
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114 if (!strbuf_avail(sb))
115 strbuf_grow(sb, 64);
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116 va_start(ap, fmt);
117 len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap);
118 va_end(ap);
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119 if (len < 0)
120 die("your vsnprintf is broken");
f1696ee3 121 if (len > strbuf_avail(sb)) {
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122 strbuf_grow(sb, len);
123 va_start(ap, fmt);
124 len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap);
125 va_end(ap);
f1696ee3 126 if (len > strbuf_avail(sb)) {
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127 die("this should not happen, your snprintf is broken");
128 }
129 }
130 strbuf_setlen(sb, sb->len + len);
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131}
132
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133size_t strbuf_fread(struct strbuf *sb, size_t size, FILE *f)
134{
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135 size_t res;
136
137 strbuf_grow(sb, size);
138 res = fread(sb->buf + sb->len, 1, size, f);
139 if (res > 0) {
140 strbuf_setlen(sb, sb->len + res);
d1df5743 141 }
b449f4cf 142 return res;
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143}
144
f1696ee3 145ssize_t strbuf_read(struct strbuf *sb, int fd, size_t hint)
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146{
147 size_t oldlen = sb->len;
148
f1696ee3 149 strbuf_grow(sb, hint ? hint : 8192);
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150 for (;;) {
151 ssize_t cnt;
152
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153 cnt = xread(fd, sb->buf + sb->len, sb->alloc - sb->len - 1);
154 if (cnt < 0) {
155 strbuf_setlen(sb, oldlen);
156 return -1;
157 }
158 if (!cnt)
159 break;
160 sb->len += cnt;
f1696ee3 161 strbuf_grow(sb, 8192);
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162 }
163
164 sb->buf[sb->len] = '\0';
165 return sb->len - oldlen;
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166}
167
e6c019d0 168int strbuf_getline(struct strbuf *sb, FILE *fp, int term)
917c9a71 169{
d1df5743 170 int ch;
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171
172 strbuf_grow(sb, 0);
173 if (feof(fp))
174 return EOF;
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175
176 strbuf_reset(sb);
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177 while ((ch = fgetc(fp)) != EOF) {
178 if (ch == term)
179 break;
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180 strbuf_grow(sb, 1);
181 sb->buf[sb->len++] = ch;
d1df5743 182 }
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183 if (ch == EOF && sb->len == 0)
184 return EOF;
b449f4cf 185
b449f4cf 186 sb->buf[sb->len] = '\0';
e6c019d0 187 return 0;
d1df5743 188}
a9390b9f 189
387e7e19 190int strbuf_read_file(struct strbuf *sb, const char *path, size_t hint)
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191{
192 int fd, len;
193
194 fd = open(path, O_RDONLY);
195 if (fd < 0)
196 return -1;
387e7e19 197 len = strbuf_read(sb, fd, hint);
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198 close(fd);
199 if (len < 0)
200 return -1;
201
202 return len;
203}