Annotation of src/usr.bin/cvs/buf.c, Revision 1.47
1.47 ! ray 1: /* $OpenBSD: buf.c,v 1.46 2006/04/11 00:49:49 ray Exp $ */
1.1 jfb 2: /*
1.2 jfb 3: * Copyright (c) 2003 Jean-Francois Brousseau <jfb@openbsd.org>
1.1 jfb 4: * All rights reserved.
5: *
6: * Redistribution and use in source and binary forms, with or without
7: * modification, are permitted provided that the following conditions
8: * are met:
9: *
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. The name of the author may not be used to endorse or promote products
13: * derived from this software without specific prior written permission.
14: *
15: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
16: * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
17: * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
18: * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
19: * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
20: * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
21: * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
22: * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
23: * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
24: * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25: */
26:
1.28 xsa 27: #include "includes.h"
1.1 jfb 28:
29: #include "buf.h"
30: #include "log.h"
1.19 joris 31: #include "xmalloc.h"
1.45 joris 32: #include "worklist.h"
1.1 jfb 33:
1.15 xsa 34: #define BUF_INCR 128
1.1 jfb 35:
36: struct cvs_buf {
1.15 xsa 37: u_int cb_flags;
1.1 jfb 38:
39: /* buffer handle and size */
1.15 xsa 40: u_char *cb_buf;
41: size_t cb_size;
1.1 jfb 42:
43: /* start and length of valid data in buffer */
1.15 xsa 44: u_char *cb_cur;
45: size_t cb_len;
1.1 jfb 46: };
47:
1.16 moritz 48: #define SIZE_LEFT(b) (b->cb_size - (size_t)(b->cb_cur - b->cb_buf) \
49: - b->cb_len)
1.1 jfb 50:
1.46 ray 51: static void cvs_buf_grow(BUF *, size_t);
1.1 jfb 52:
53: /*
54: * cvs_buf_alloc()
55: *
56: * Create a new buffer structure and return a pointer to it. This structure
57: * uses dynamically-allocated memory and must be freed with cvs_buf_free(),
58: * once the buffer is no longer needed.
59: */
1.15 xsa 60: BUF *
1.1 jfb 61: cvs_buf_alloc(size_t len, u_int flags)
62: {
63: BUF *b;
64:
1.42 ray 65: b = xmalloc(sizeof(*b));
1.30 niallo 66: /* Postpone creation of zero-sized buffers */
1.47 ! ray 67: if (len > 0)
! 68: b->cb_buf = xcalloc(1, len);
! 69: else
1.31 niallo 70: b->cb_buf = NULL;
1.1 jfb 71:
72: b->cb_flags = flags;
73: b->cb_size = len;
1.8 jfb 74: b->cb_cur = b->cb_buf;
1.1 jfb 75: b->cb_len = 0;
76:
77: return (b);
78: }
79:
80: /*
81: * cvs_buf_load()
82: *
83: * Open the file specified by <path> and load all of its contents into a
84: * buffer.
1.20 xsa 85: * Returns the loaded buffer on success.
1.1 jfb 86: */
1.15 xsa 87: BUF *
1.1 jfb 88: cvs_buf_load(const char *path, u_int flags)
89: {
90: int fd;
91: ssize_t ret;
92: size_t len;
1.8 jfb 93: u_char *bp;
1.1 jfb 94: struct stat st;
95: BUF *buf;
96:
1.34 niallo 97: if ((fd = open(path, O_RDONLY, 0600)) == -1) {
1.35 xsa 98: cvs_log(LP_ERRNO, "%s", path);
1.34 niallo 99: return (NULL);
100: }
1.1 jfb 101:
1.20 xsa 102: if (fstat(fd, &st) == -1)
103: fatal("cvs_buf_load: fstat: %s", strerror(errno));
1.1 jfb 104:
1.25 joris 105: buf = cvs_buf_alloc((size_t)st.st_size, flags);
1.1 jfb 106: for (bp = buf->cb_cur; ; bp += (size_t)ret) {
1.16 moritz 107: len = SIZE_LEFT(buf);
1.1 jfb 108: ret = read(fd, bp, len);
109: if (ret == -1) {
1.8 jfb 110: cvs_buf_free(buf);
1.20 xsa 111: fatal("cvs_buf_load: read: %s", strerror(errno));
1.5 deraadt 112: } else if (ret == 0)
1.1 jfb 113: break;
114:
115: buf->cb_len += (size_t)ret;
116: }
117:
118: (void)close(fd);
119:
120: return (buf);
121: }
122:
123: /*
124: * cvs_buf_free()
125: *
126: * Free the buffer <b> and all associated data.
127: */
128: void
129: cvs_buf_free(BUF *b)
130: {
1.31 niallo 131: if (b->cb_buf != NULL)
132: xfree(b->cb_buf);
1.19 joris 133: xfree(b);
1.1 jfb 134: }
135:
136: /*
137: * cvs_buf_release()
138: *
139: * Free the buffer <b>'s structural information but do not free the contents
140: * of the buffer. Instead, they are returned and should be freed later using
141: * free().
142: */
1.17 xsa 143: void *
1.1 jfb 144: cvs_buf_release(BUF *b)
145: {
1.8 jfb 146: u_char *tmp;
1.6 tedu 147:
1.1 jfb 148: tmp = b->cb_buf;
1.19 joris 149: xfree(b);
1.1 jfb 150: return (tmp);
151: }
152:
153: /*
154: * cvs_buf_empty()
155: *
156: * Empty the contents of the buffer <b> and reset pointers.
157: */
158: void
159: cvs_buf_empty(BUF *b)
160: {
1.16 moritz 161: memset(b->cb_buf, 0, b->cb_size);
1.8 jfb 162: b->cb_cur = b->cb_buf;
1.1 jfb 163: b->cb_len = 0;
164: }
165:
166: /*
167: * cvs_buf_set()
168: *
1.16 moritz 169: * Set the contents of the buffer <b> at offset <off> to the first <len>
170: * bytes of data found at <src>. If the buffer was not created with
171: * BUF_AUTOEXT, as many bytes as possible will be copied in the buffer.
1.1 jfb 172: */
1.16 moritz 173: ssize_t
1.1 jfb 174: cvs_buf_set(BUF *b, const void *src, size_t len, size_t off)
175: {
1.23 xsa 176: size_t rlen = 0;
1.1 jfb 177:
178: if (b->cb_size < (len + off)) {
1.46 ray 179: if ((b->cb_flags & BUF_AUTOEXT))
180: cvs_buf_grow(b, len + off - b->cb_size);
1.1 jfb 181: else
182: rlen = b->cb_size - off;
1.5 deraadt 183: } else
1.1 jfb 184: rlen = len;
185:
186: memcpy((b->cb_buf + off), src, rlen);
187:
188: if (b->cb_len == 0) {
189: b->cb_cur = b->cb_buf + off;
190: b->cb_len = rlen;
191: }
192:
1.16 moritz 193: return (rlen);
1.1 jfb 194: }
195:
196: /*
197: * cvs_buf_putc()
198: *
199: * Append a single character <c> to the end of the buffer <b>.
200: */
1.39 xsa 201: void
1.1 jfb 202: cvs_buf_putc(BUF *b, int c)
203: {
204: u_char *bp;
205:
206: bp = b->cb_cur + b->cb_len;
207: if (bp == (b->cb_buf + b->cb_size)) {
208: /* extend */
1.46 ray 209: if (b->cb_flags & BUF_AUTOEXT)
210: cvs_buf_grow(b, (size_t)BUF_INCR);
211: else
1.21 xsa 212: fatal("cvs_buf_putc failed");
1.1 jfb 213:
214: /* the buffer might have been moved */
215: bp = b->cb_cur + b->cb_len;
216: }
217: *bp = (u_char)c;
218: b->cb_len++;
1.29 niallo 219: }
220:
221: /*
222: * cvs_buf_getc()
223: *
224: * Return u_char at buffer position <pos>.
225: *
226: */
227: u_char
1.40 ray 228: cvs_buf_getc(BUF *b, size_t pos)
1.29 niallo 229: {
230: return (b->cb_cur[pos]);
1.1 jfb 231: }
232:
233: /*
234: * cvs_buf_append()
235: *
236: * Append <len> bytes of data pointed to by <data> to the buffer <b>. If the
237: * buffer is too small to accept all data, it will attempt to append as much
238: * data as possible, or if the BUF_AUTOEXT flag is set for the buffer, it
239: * will get resized to an appropriate size to accept all data.
1.27 joris 240: * Returns the number of bytes successfully appended to the buffer.
1.1 jfb 241: */
242: ssize_t
243: cvs_buf_append(BUF *b, const void *data, size_t len)
244: {
245: size_t left, rlen;
1.8 jfb 246: u_char *bp, *bep;
1.1 jfb 247:
248: bp = b->cb_cur + b->cb_len;
249: bep = b->cb_buf + b->cb_size;
250: left = bep - bp;
251: rlen = len;
252:
253: if (left < len) {
254: if (b->cb_flags & BUF_AUTOEXT) {
1.46 ray 255: cvs_buf_grow(b, len - left);
1.1 jfb 256: bp = b->cb_cur + b->cb_len;
1.5 deraadt 257: } else
1.1 jfb 258: rlen = bep - bp;
259: }
260:
261: memcpy(bp, data, rlen);
262: b->cb_len += rlen;
263:
264: return (rlen);
265: }
266:
267: /*
268: * cvs_buf_fappend()
269: *
270: */
1.37 ray 271: ssize_t
1.1 jfb 272: cvs_buf_fappend(BUF *b, const char *fmt, ...)
273: {
1.37 ray 274: ssize_t ret;
1.1 jfb 275: char *str;
276: va_list vap;
277:
278: va_start(vap, fmt);
1.4 pat 279: ret = vasprintf(&str, fmt, vap);
280: va_end(vap);
1.1 jfb 281:
1.20 xsa 282: if (ret == -1)
283: fatal("cvs_buf_fappend: failed to format data");
1.1 jfb 284:
1.18 xsa 285: ret = cvs_buf_append(b, str, (size_t)ret);
1.19 joris 286: xfree(str);
1.1 jfb 287: return (ret);
288: }
289:
290: /*
1.16 moritz 291: * cvs_buf_len()
1.1 jfb 292: *
293: * Returns the size of the buffer that is being used.
294: */
295: size_t
1.16 moritz 296: cvs_buf_len(BUF *b)
1.1 jfb 297: {
298: return (b->cb_len);
299: }
300:
301: /*
1.7 djm 302: * cvs_buf_write_fd()
1.1 jfb 303: *
1.7 djm 304: * Write the contents of the buffer <b> to the specified <fd>
1.1 jfb 305: */
306: int
1.7 djm 307: cvs_buf_write_fd(BUF *b, int fd)
1.1 jfb 308: {
309: u_char *bp;
310: size_t len;
311: ssize_t ret;
312:
313: len = b->cb_len;
314: bp = b->cb_cur;
315:
316: do {
1.16 moritz 317: ret = write(fd, bp, len);
1.1 jfb 318: if (ret == -1) {
1.7 djm 319: if (errno == EINTR || errno == EAGAIN)
320: continue;
1.22 xsa 321: return (-1);
1.1 jfb 322: }
323:
324: len -= (size_t)ret;
325: bp += (size_t)ret;
326: } while (len > 0);
327:
1.7 djm 328: return (0);
329: }
330:
331: /*
332: * cvs_buf_write()
333: *
334: * Write the contents of the buffer <b> to the file whose path is given in
335: * <path>. If the file does not exist, it is created with mode <mode>.
336: */
337: int
338: cvs_buf_write(BUF *b, const char *path, mode_t mode)
339: {
1.22 xsa 340: int fd;
1.32 niallo 341: open:
342: if ((fd = open(path, O_WRONLY|O_CREAT|O_TRUNC, mode)) == -1) {
343: if ((errno == EACCES) && (unlink(path) != -1))
344: goto open;
345: else
346: fatal("open: `%s': %s", path, strerror(errno));
347: }
1.7 djm 348:
1.22 xsa 349: if (cvs_buf_write_fd(b, fd) == -1) {
1.7 djm 350: (void)unlink(path);
1.22 xsa 351: fatal("cvs_buf_write: cvs_buf_write_fd: `%s'", path);
1.7 djm 352: }
1.44 niallo 353:
354: if (fchmod(fd, mode) < 0)
355: cvs_log(LP_ERRNO, "permissions not set on file %s", path);
356:
1.1 jfb 357: (void)close(fd);
1.24 joris 358:
1.22 xsa 359: return (0);
1.1 jfb 360: }
361:
1.7 djm 362: /*
363: * cvs_buf_write_stmp()
364: *
1.13 joris 365: * Write the contents of the buffer <b> to a temporary file whose path is
1.7 djm 366: * specified using <template> (see mkstemp.3). NB. This function will modify
367: * <template>, as per mkstemp
368: */
1.38 niallo 369: void
1.7 djm 370: cvs_buf_write_stmp(BUF *b, char *template, mode_t mode)
371: {
1.22 xsa 372: int fd;
1.7 djm 373:
1.20 xsa 374: if ((fd = mkstemp(template)) == -1)
375: fatal("mkstemp: `%s': %s", template, strerror(errno));
1.7 djm 376:
1.45 joris 377: #if defined(RCSPROG)
378: cvs_worklist_add(template, &rcs_temp_files);
379: #endif
380:
1.22 xsa 381: if (cvs_buf_write_fd(b, fd) == -1) {
1.7 djm 382: (void)unlink(template);
1.22 xsa 383: fatal("cvs_buf_write_stmp: cvs_buf_write_fd: `%s'", template);
1.7 djm 384: }
1.45 joris 385:
1.44 niallo 386: if (fchmod(fd, mode) < 0)
387: cvs_log(LP_ERRNO, "permissions not set on temporary file %s",
388: template);
389:
1.7 djm 390: (void)close(fd);
391: }
1.1 jfb 392:
393: /*
394: * cvs_buf_grow()
395: *
396: * Grow the buffer <b> by <len> bytes. The contents are unchanged by this
397: * operation regardless of the result.
398: */
1.46 ray 399: static void
1.1 jfb 400: cvs_buf_grow(BUF *b, size_t len)
401: {
402: void *tmp;
403: size_t diff;
404:
1.8 jfb 405: diff = b->cb_cur - b->cb_buf;
1.46 ray 406: tmp = xrealloc(b->cb_buf, 1, b->cb_size + len);
407: b->cb_buf = tmp;
1.1 jfb 408: b->cb_size += len;
409:
410: /* readjust pointers in case the buffer moved in memory */
411: b->cb_cur = b->cb_buf + diff;
412: }
1.43 xsa 413:
414: #if !defined(RCSPROG)
415: /*
416: * cvs_buf_copy()
417: *
418: * Copy the first <len> bytes of data in the buffer <b> starting at offset
419: * <off> in the destination buffer <dst>, which can accept up to <len> bytes.
420: * Returns the number of bytes successfully copied, or -1 on failure.
421: */
422: ssize_t
423: cvs_buf_copy(BUF *b, size_t off, void *dst, size_t len)
424: {
425: size_t rc;
426:
427: if (off > b->cb_len)
428: fatal("cvs_buf_copy failed");
429:
430: rc = MIN(len, (b->cb_len - off));
431: memcpy(dst, b->cb_buf + off, rc);
432:
433: return (ssize_t)rc;
434: }
435:
436: /*
437: * cvs_buf_peek()
438: *
439: * Peek at the contents of the buffer <b> at offset <off>.
440: */
441: const void *
442: cvs_buf_peek(BUF *b, size_t off)
443: {
444: if (off >= b->cb_len)
445: return (NULL);
446:
447: return (b->cb_buf + off);
448: }
449: #endif /* RCSPROG */
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