Annotation of src/usr.bin/ranlib/build.c, Revision 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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