builtin-apply: stronger indent-with-on-tab fixing
[git/jbf-maint.git] / strbuf.c
blobb9b194b3200e950cfdb3c696d92ece0657e9d344
1 #include "cache.h"
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 */
8 char strbuf_slopbuf[1];
10 void strbuf_init(struct strbuf *sb, size_t hint)
12 sb->alloc = sb->len = 0;
13 sb->buf = strbuf_slopbuf;
14 if (hint)
15 strbuf_grow(sb, hint);
18 void strbuf_release(struct strbuf *sb)
20 if (sb->alloc) {
21 free(sb->buf);
22 strbuf_init(sb, 0);
26 char *strbuf_detach(struct strbuf *sb, size_t *sz)
28 char *res = sb->alloc ? sb->buf : NULL;
29 if (sz)
30 *sz = sb->len;
31 strbuf_init(sb, 0);
32 return res;
35 void strbuf_attach(struct strbuf *sb, void *buf, size_t len, size_t alloc)
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';
45 void strbuf_grow(struct strbuf *sb, size_t extra)
47 if (sb->len + extra + 1 <= sb->len)
48 die("you want to use way too much memory");
49 if (!sb->alloc)
50 sb->buf = NULL;
51 ALLOC_GROW(sb->buf, sb->len + extra + 1, sb->alloc);
54 void strbuf_rtrim(struct strbuf *sb)
56 while (sb->len > 0 && isspace((unsigned char)sb->buf[sb->len - 1]))
57 sb->len--;
58 sb->buf[sb->len] = '\0';
61 int strbuf_cmp(struct strbuf *a, struct strbuf *b)
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;
73 void strbuf_splice(struct strbuf *sb, size_t pos, size_t len,
74 const void *data, size_t dlen)
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");
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);
92 void strbuf_insert(struct strbuf *sb, size_t pos, const void *data, size_t len)
94 strbuf_splice(sb, pos, 0, data, len);
97 void strbuf_remove(struct strbuf *sb, size_t pos, size_t len)
99 strbuf_splice(sb, pos, len, NULL, 0);
102 void strbuf_add(struct strbuf *sb, const void *data, size_t len)
104 strbuf_grow(sb, len);
105 memcpy(sb->buf + sb->len, data, len);
106 strbuf_setlen(sb, sb->len + len);
109 void strbuf_adddup(struct strbuf *sb, size_t pos, size_t len)
111 strbuf_grow(sb, len);
112 memcpy(sb->buf + sb->len, sb->buf + pos, len);
113 strbuf_setlen(sb, sb->len + len);
116 void strbuf_addf(struct strbuf *sb, const char *fmt, ...)
118 int len;
119 va_list ap;
121 if (!strbuf_avail(sb))
122 strbuf_grow(sb, 64);
123 va_start(ap, fmt);
124 len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap);
125 va_end(ap);
126 if (len < 0)
127 die("your vsnprintf is broken");
128 if (len > strbuf_avail(sb)) {
129 strbuf_grow(sb, len);
130 va_start(ap, fmt);
131 len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap);
132 va_end(ap);
133 if (len > strbuf_avail(sb)) {
134 die("this should not happen, your snprintf is broken");
137 strbuf_setlen(sb, sb->len + len);
140 void strbuf_expand(struct strbuf *sb, const char *format,
141 const char **placeholders, expand_fn_t fn, void *context)
143 for (;;) {
144 const char *percent, **p;
146 percent = strchrnul(format, '%');
147 strbuf_add(sb, format, percent - format);
148 if (!*percent)
149 break;
150 format = percent + 1;
152 for (p = placeholders; *p; p++) {
153 if (!prefixcmp(format, *p))
154 break;
156 if (*p) {
157 fn(sb, *p, context);
158 format += strlen(*p);
159 } else
160 strbuf_addch(sb, '%');
164 size_t strbuf_fread(struct strbuf *sb, size_t size, FILE *f)
166 size_t res;
168 strbuf_grow(sb, size);
169 res = fread(sb->buf + sb->len, 1, size, f);
170 if (res > 0) {
171 strbuf_setlen(sb, sb->len + res);
173 return res;
176 ssize_t strbuf_read(struct strbuf *sb, int fd, size_t hint)
178 size_t oldlen = sb->len;
180 strbuf_grow(sb, hint ? hint : 8192);
181 for (;;) {
182 ssize_t cnt;
184 cnt = xread(fd, sb->buf + sb->len, sb->alloc - sb->len - 1);
185 if (cnt < 0) {
186 strbuf_setlen(sb, oldlen);
187 return -1;
189 if (!cnt)
190 break;
191 sb->len += cnt;
192 strbuf_grow(sb, 8192);
195 sb->buf[sb->len] = '\0';
196 return sb->len - oldlen;
199 int strbuf_getline(struct strbuf *sb, FILE *fp, int term)
201 int ch;
203 strbuf_grow(sb, 0);
204 if (feof(fp))
205 return EOF;
207 strbuf_reset(sb);
208 while ((ch = fgetc(fp)) != EOF) {
209 if (ch == term)
210 break;
211 strbuf_grow(sb, 1);
212 sb->buf[sb->len++] = ch;
214 if (ch == EOF && sb->len == 0)
215 return EOF;
217 sb->buf[sb->len] = '\0';
218 return 0;
221 int strbuf_read_file(struct strbuf *sb, const char *path, size_t hint)
223 int fd, len;
225 fd = open(path, O_RDONLY);
226 if (fd < 0)
227 return -1;
228 len = strbuf_read(sb, fd, hint);
229 close(fd);
230 if (len < 0)
231 return -1;
233 return len;