hg-to-git: use git init instead of git init-db
[git/jrn.git] / strbuf.c
blob4aed75265e945d7b8dfafb36913006376768b4d3
1 #include "cache.h"
3 int prefixcmp(const char *str, const char *prefix)
5 for (; ; str++, prefix++)
6 if (!*prefix)
7 return 0;
8 else if (*str != *prefix)
9 return (unsigned char)*prefix - (unsigned char)*str;
13 * Used as the default ->buf value, so that people can always assume
14 * buf is non NULL and ->buf is NUL terminated even for a freshly
15 * initialized strbuf.
17 char strbuf_slopbuf[1];
19 void strbuf_init(struct strbuf *sb, size_t hint)
21 sb->alloc = sb->len = 0;
22 sb->buf = strbuf_slopbuf;
23 if (hint)
24 strbuf_grow(sb, hint);
27 void strbuf_release(struct strbuf *sb)
29 if (sb->alloc) {
30 free(sb->buf);
31 strbuf_init(sb, 0);
35 char *strbuf_detach(struct strbuf *sb, size_t *sz)
37 char *res = sb->alloc ? sb->buf : NULL;
38 if (sz)
39 *sz = sb->len;
40 strbuf_init(sb, 0);
41 return res;
44 void strbuf_attach(struct strbuf *sb, void *buf, size_t len, size_t alloc)
46 strbuf_release(sb);
47 sb->buf = buf;
48 sb->len = len;
49 sb->alloc = alloc;
50 strbuf_grow(sb, 0);
51 sb->buf[sb->len] = '\0';
54 void strbuf_grow(struct strbuf *sb, size_t extra)
56 if (sb->len + extra + 1 <= sb->len)
57 die("you want to use way too much memory");
58 if (!sb->alloc)
59 sb->buf = NULL;
60 ALLOC_GROW(sb->buf, sb->len + extra + 1, sb->alloc);
63 void strbuf_rtrim(struct strbuf *sb)
65 while (sb->len > 0 && isspace((unsigned char)sb->buf[sb->len - 1]))
66 sb->len--;
67 sb->buf[sb->len] = '\0';
70 int strbuf_cmp(struct strbuf *a, struct strbuf *b)
72 int cmp;
73 if (a->len < b->len) {
74 cmp = memcmp(a->buf, b->buf, a->len);
75 return cmp ? cmp : -1;
76 } else {
77 cmp = memcmp(a->buf, b->buf, b->len);
78 return cmp ? cmp : a->len != b->len;
82 void strbuf_splice(struct strbuf *sb, size_t pos, size_t len,
83 const void *data, size_t dlen)
85 if (pos + len < pos)
86 die("you want to use way too much memory");
87 if (pos > sb->len)
88 die("`pos' is too far after the end of the buffer");
89 if (pos + len > sb->len)
90 die("`pos + len' is too far after the end of the buffer");
92 if (dlen >= len)
93 strbuf_grow(sb, dlen - len);
94 memmove(sb->buf + pos + dlen,
95 sb->buf + pos + len,
96 sb->len - pos - len);
97 memcpy(sb->buf + pos, data, dlen);
98 strbuf_setlen(sb, sb->len + dlen - len);
101 void strbuf_insert(struct strbuf *sb, size_t pos, const void *data, size_t len)
103 strbuf_splice(sb, pos, 0, data, len);
106 void strbuf_remove(struct strbuf *sb, size_t pos, size_t len)
108 strbuf_splice(sb, pos, len, NULL, 0);
111 void strbuf_add(struct strbuf *sb, const void *data, size_t len)
113 strbuf_grow(sb, len);
114 memcpy(sb->buf + sb->len, data, len);
115 strbuf_setlen(sb, sb->len + len);
118 void strbuf_adddup(struct strbuf *sb, size_t pos, size_t len)
120 strbuf_grow(sb, len);
121 memcpy(sb->buf + sb->len, sb->buf + pos, len);
122 strbuf_setlen(sb, sb->len + len);
125 void strbuf_addf(struct strbuf *sb, const char *fmt, ...)
127 int len;
128 va_list ap;
130 if (!strbuf_avail(sb))
131 strbuf_grow(sb, 64);
132 va_start(ap, fmt);
133 len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap);
134 va_end(ap);
135 if (len < 0)
136 die("your vsnprintf is broken");
137 if (len > strbuf_avail(sb)) {
138 strbuf_grow(sb, len);
139 va_start(ap, fmt);
140 len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap);
141 va_end(ap);
142 if (len > strbuf_avail(sb)) {
143 die("this should not happen, your snprintf is broken");
146 strbuf_setlen(sb, sb->len + len);
149 void strbuf_expand(struct strbuf *sb, const char *format, expand_fn_t fn,
150 void *context)
152 for (;;) {
153 const char *percent;
154 size_t consumed;
156 percent = strchrnul(format, '%');
157 strbuf_add(sb, format, percent - format);
158 if (!*percent)
159 break;
160 format = percent + 1;
162 consumed = fn(sb, format, context);
163 if (consumed)
164 format += consumed;
165 else
166 strbuf_addch(sb, '%');
170 size_t strbuf_fread(struct strbuf *sb, size_t size, FILE *f)
172 size_t res;
174 strbuf_grow(sb, size);
175 res = fread(sb->buf + sb->len, 1, size, f);
176 if (res > 0) {
177 strbuf_setlen(sb, sb->len + res);
179 return res;
182 ssize_t strbuf_read(struct strbuf *sb, int fd, size_t hint)
184 size_t oldlen = sb->len;
186 strbuf_grow(sb, hint ? hint : 8192);
187 for (;;) {
188 ssize_t cnt;
190 cnt = xread(fd, sb->buf + sb->len, sb->alloc - sb->len - 1);
191 if (cnt < 0) {
192 strbuf_setlen(sb, oldlen);
193 return -1;
195 if (!cnt)
196 break;
197 sb->len += cnt;
198 strbuf_grow(sb, 8192);
201 sb->buf[sb->len] = '\0';
202 return sb->len - oldlen;
205 int strbuf_getline(struct strbuf *sb, FILE *fp, int term)
207 int ch;
209 strbuf_grow(sb, 0);
210 if (feof(fp))
211 return EOF;
213 strbuf_reset(sb);
214 while ((ch = fgetc(fp)) != EOF) {
215 if (ch == term)
216 break;
217 strbuf_grow(sb, 1);
218 sb->buf[sb->len++] = ch;
220 if (ch == EOF && sb->len == 0)
221 return EOF;
223 sb->buf[sb->len] = '\0';
224 return 0;
227 int strbuf_read_file(struct strbuf *sb, const char *path, size_t hint)
229 int fd, len;
231 fd = open(path, O_RDONLY);
232 if (fd < 0)
233 return -1;
234 len = strbuf_read(sb, fd, hint);
235 close(fd);
236 if (len < 0)
237 return -1;
239 return len;