Annotation of src/usr.bin/ranlib/build.c, Revision 1.1.1.1
1.1 deraadt 1: /*-
2: * Copyright (c) 1990 The Regents of the University of California.
3: * All rights reserved.
4: *
5: * This code is derived from software contributed to Berkeley by
6: * Hugh Smith at The University of Guelph.
7: *
8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following conditions
10: * are met:
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in the
15: * documentation and/or other materials provided with the distribution.
16: * 3. All advertising materials mentioning features or use of this software
17: * must display the following acknowledgement:
18: * This product includes software developed by the University of
19: * California, Berkeley and its contributors.
20: * 4. Neither the name of the University nor the names of its contributors
21: * may be used to endorse or promote products derived from this software
22: * without specific prior written permission.
23: *
24: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34: * SUCH DAMAGE.
35: */
36:
37: #ifndef lint
38: /*static char sccsid[] = "from: @(#)build.c 5.3 (Berkeley) 3/12/91";*/
39: static char rcsid[] = "$Id: build.c,v 1.8 1995/06/27 00:28:17 jtc Exp $";
40: #endif /* not lint */
41:
42: #include <sys/types.h>
43: #include <sys/stat.h>
44: #include <errno.h>
45: #include <fcntl.h>
46: #include <a.out.h>
47: #include <dirent.h>
48: #include <unistd.h>
49: #include <ar.h>
50: #include <ranlib.h>
51: #include <stdio.h>
52: #include <string.h>
53: #include <archive.h>
54:
55: extern CHDR chdr; /* converted header */
56: extern char *archive; /* archive name */
57: extern char *tname; /* temporary file "name" */
58:
59: typedef struct _rlib {
60: struct _rlib *next; /* next structure */
61: off_t pos; /* offset of defining archive file */
62: char *sym; /* symbol */
63: int symlen; /* strlen(sym) */
64: } RLIB;
65: RLIB *rhead, **pnext;
66:
67: static FILE *fp;
68: static long symcnt; /* symbol count */
69: static long tsymlen; /* total string length */
70:
71: static void rexec(), symobj();
72: extern void *emalloc();
73:
74: build()
75: {
76: CF cf;
77: int afd, tfd;
78: off_t size;
79:
80: afd = open_archive(O_RDWR);
81: fp = fdopen(afd, "r+");
82: tfd = tmp();
83:
84: SETCF(afd, archive, tfd, tname, RPAD|WPAD);
85:
86: /* Read through the archive, creating list of symbols. */
87: symcnt = tsymlen = 0;
88: pnext = &rhead;
89: while(get_arobj(afd)) {
90: if (!strcmp(chdr.name, RANLIBMAG)) {
91: skip_arobj(afd);
92: continue;
93: }
94: rexec(afd, tfd);
95: put_arobj(&cf, (struct stat *)NULL);
96: }
97: *pnext = NULL;
98:
99: /* Create the symbol table. */
100: symobj();
101:
102: /* Copy the saved objects into the archive. */
103: size = lseek(tfd, (off_t)0, SEEK_CUR);
104: (void)lseek(tfd, (off_t)0, SEEK_SET);
105: SETCF(tfd, tname, afd, archive, NOPAD);
106: copy_ar(&cf, size);
107: (void)ftruncate(afd, lseek(afd, (off_t)0, SEEK_CUR));
108: (void)close(tfd);
109:
110: /* Set the time. */
111: settime(afd);
112: close_archive(afd);
113: return(0);
114: }
115:
116: /*
117: * rexec
118: * Read the exec structure; ignore any files that don't look
119: * exactly right.
120: */
121: static void
122: rexec(rfd, wfd)
123: register int rfd;
124: int wfd;
125: {
126: register RLIB *rp;
127: register long nsyms;
128: register int nr, symlen;
129: register char *strtab, *sym;
130: struct exec ebuf;
131: struct nlist nl;
132: off_t r_off, w_off;
133: long strsize;
134:
135: /* Get current offsets for original and tmp files. */
136: r_off = lseek(rfd, (off_t)0, SEEK_CUR);
137: w_off = lseek(wfd, (off_t)0, SEEK_CUR);
138:
139: /* Read in exec structure. */
140: nr = read(rfd, (char *)&ebuf, sizeof(struct exec));
141: if (nr != sizeof(struct exec))
142: goto badread;
143:
144: /* Check magic number and symbol count. */
145: if (N_BADMAG(ebuf) || ebuf.a_syms == 0)
146: goto bad1;
147:
148: /* Seek to string table. */
149: if (lseek(rfd, N_STROFF(ebuf) + r_off, SEEK_SET) == (off_t)-1)
150: error(archive);
151:
152: /* Read in size of the string table. */
153: nr = read(rfd, (char *)&strsize, sizeof(strsize));
154: if (nr != sizeof(strsize))
155: goto badread;
156:
157: /* Read in the string table. */
158: strsize -= sizeof(strsize);
159: strtab = (char *)emalloc(strsize);
160: nr = read(rfd, strtab, strsize);
161: if (nr != strsize) {
162: badread: if (nr < 0)
163: error(archive);
164: goto bad2;
165: }
166:
167: /* Seek to symbol table. */
168: if (fseek(fp, N_SYMOFF(ebuf) + r_off, SEEK_SET) == (off_t)-1)
169: goto bad2;
170:
171: /* For each symbol read the nlist entry and save it as necessary. */
172: nsyms = ebuf.a_syms / sizeof(struct nlist);
173: while (nsyms--) {
174: if (!fread((char *)&nl, sizeof(struct nlist), 1, fp)) {
175: if (feof(fp))
176: badfmt();
177: error(archive);
178: }
179:
180: /* Ignore if no name or local. */
181: if (!nl.n_un.n_strx || !(nl.n_type & N_EXT))
182: continue;
183:
184: /*
185: * If the symbol is an undefined external and the n_value
186: * field is non-zero, keep it.
187: */
188: if ((nl.n_type & N_TYPE) == N_UNDF && !nl.n_value)
189: continue;
190:
191: /* First four bytes are the table size. */
192: sym = strtab + nl.n_un.n_strx - sizeof(long);
193: symlen = strlen(sym) + 1;
194:
195: rp = (RLIB *)emalloc(sizeof(RLIB));
196: rp->sym = (char *)emalloc(symlen);
197: bcopy(sym, rp->sym, symlen);
198: rp->symlen = symlen;
199: rp->pos = w_off;
200:
201: /* Build in forward order for "ar -m" command. */
202: *pnext = rp;
203: pnext = &rp->next;
204:
205: ++symcnt;
206: tsymlen += symlen;
207: }
208:
209: bad2: free(strtab);
210: bad1: (void)lseek(rfd, (off_t)r_off, SEEK_SET);
211: }
212:
213: /*
214: * symobj --
215: * Write the symbol table into the archive, computing offsets as
216: * writing.
217: */
218: static void
219: symobj()
220: {
221: register RLIB *rp, *rnext;
222: struct ranlib rn;
223: char hb[sizeof(struct ar_hdr) + 1], pad;
224: long ransize, size, stroff;
225:
226: /* Rewind the archive, leaving the magic number. */
227: if (fseek(fp, (off_t)SARMAG, SEEK_SET) == (off_t)-1)
228: error(archive);
229:
230: /* Size of the ranlib archive file, pad if necessary. */
231: ransize = sizeof(long) +
232: symcnt * sizeof(struct ranlib) + sizeof(long) + tsymlen;
233: if (ransize & 01) {
234: ++ransize;
235: pad = '\n';
236: } else
237: pad = '\0';
238:
239: /* Put out the ranlib archive file header. */
240: #define DEFMODE (S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH)
241: (void)sprintf(hb, HDR2, RANLIBMAG, 0L, getuid(), getgid(),
242: DEFMODE & ~umask(0), (off_t)ransize, ARFMAG);
243: if (!fwrite(hb, sizeof(struct ar_hdr), 1, fp))
244: error(tname);
245:
246: /* First long is the size of the ranlib structure section. */
247: size = symcnt * sizeof(struct ranlib);
248: if (!fwrite((char *)&size, sizeof(size), 1, fp))
249: error(tname);
250:
251: /* Offset of the first archive file. */
252: size = SARMAG + sizeof(struct ar_hdr) + ransize;
253:
254: /*
255: * Write out the ranlib structures. The offset into the string
256: * table is cumulative, the offset into the archive is the value
257: * set in rexec() plus the offset to the first archive file.
258: */
259: for (rp = rhead, stroff = 0; rp; rp = rp->next) {
260: rn.ran_un.ran_strx = stroff;
261: stroff += rp->symlen;
262: rn.ran_off = size + rp->pos;
263: if (!fwrite((char *)&rn, sizeof(struct ranlib), 1, fp))
264: error(archive);
265: }
266:
267: /* Second long is the size of the string table. */
268: if (!fwrite((char *)&tsymlen, sizeof(tsymlen), 1, fp))
269: error(tname);
270:
271: /* Write out the string table. */
272: for (rp = rhead; rp; rp = rnext) {
273: if (!fwrite(rp->sym, rp->symlen, 1, fp))
274: error(tname);
275: rnext = rp->next;
276: free(rp);
277: }
278: rhead = NULL;
279:
280: if (pad && !fwrite(&pad, sizeof(pad), 1, fp))
281: error(tname);
282:
283: (void)fflush(fp);
284: }
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