scc

scc-ranlib.c (5885B)

---

 #include <ctype.h>
 #include <errno.h>
 #include <limits.h>
 #include <stdarg.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <time.h>
 
 #include <scc/ar.h>
 #include <scc/arg.h>
 #include <scc/mach.h>
 #include <scc/scc.h>
 
 #define NR_SYMDEF 32
 
 typedef struct symdef Symdef;
 
 struct symdef {
 	char *name;
 	int type;
 	long offset;
 	Symdef *hash, *next;
 };
 
 static char *namidx;
 static long nsymbols;
 static int status, artype, nolib;
 static char *filename, *membname;
 static Symdef *htab[NR_SYMDEF], *head;
 static long offset;
 char *argv0;
 
 static void
 error(char *fmt, ...)
 {
 	va_list va;
 
 	va_start(va, fmt);
 	fprintf(stderr, "ranlib: %s: ", filename);
 	if (membname)
 		fprintf(stderr, "%s: ", membname);
 	vfprintf(stderr, fmt, va);
 	putc('\n', stderr);
 	va_end(va);
 
 	status = EXIT_FAILURE;
 }
 
 Symdef *
 lookup(char *name)
 {
 	unsigned h;
 	Symdef *dp;
 	char *s;
 	size_t len;
 
 	h = genhash(name) % NR_SYMDEF;
 
 	for (dp = htab[h]; dp; dp = dp->next) {
 		if (!strcmp(dp->name, name))
 			return dp;
 	}
 
 	len = strlen(name) + 1;
 	dp = malloc(sizeof(*dp));
 	s = malloc(len);
 	if (!dp || !s) {
 		free(s);
 		free(dp);
 		return NULL;
 	}
 
 	nsymbols++;
 	dp->name = s;
 	memcpy(dp->name, name, len);
 	dp->type = 'U';
 	dp->offset = -1;
 	dp->hash = htab[h];
 	htab[h] = dp;
 	dp->next = head;
 	head = dp;
 
 	return dp;
 }
 
 static int
 newsymbol(Symbol *sym)
 {
 	Symdef *np;
 
 	if (!isupper(sym->type) || sym->type == 'N')
 		return 1;
 
 	if ((np = lookup(sym->name)) == NULL) {
 		error(strerror(errno));
 		return 0;
 	}
 
 	switch (np->type) {
 	case 'C':
 		if (sym->type == 'C')
 			break;
 	case 'U':
 		np->type = sym->type;
 		np->offset = offset;
 		break;
 	default:
 		if (sym->type != 'C') {
 			error("multiple definitions of '%s'", sym->name);
 			return 0;
 		}
 	}
 
 	return 1;
 }
 
 static void
 freehash(void)
 {
 	Symdef **npp, *next, *np;
 
 	for (npp = htab; npp < &htab[NR_SYMDEF]; npp++)
 		*npp = NULL;
 
 	for (np = head; np; np = next) {
 		next = np->next;
 		free(np->name);
 		free(np);
 	}
 
 	head = NULL;
 }
 
 static int
 newmember(FILE *fp)
 {
 	int i,t, ret = 0;
 	Obj *obj;
 	Symbol sym;
 
 	offset = ftell(fp);
 
 	if (offset == EOF) {
 		error(strerror(errno));
 		return 0;
 	}
 
 	t = objprobe(fp, NULL);
 	if (t == -1 || artype != -1 && artype != t) {
 		nolib = 1;
 		return 0;
 	}
 	artype = t;
 
 	if ((obj = newobj(t)) == NULL) {
 		error(strerror(errno));
 		return 0;
 	}
 	namidx = obj->index;
 
 	if (readobj(obj, fp) < 0) {
 		error(strerror(errno));
 		goto error;
 	}
 
 	for (i = 0; getsym(obj, &i, &sym); i++) {
 		if (!newsymbol(&sym))
 			goto error;
 	}
 
 	ret = 1;
 
 error:
 	delobj(obj);
 	return ret;
 }
 
 static int
 readsyms(FILE *fp)
 {
 	long cur, off;
 	char memb[SARNAM+1];
 
 	nolib = 0;
 	artype = -1;
 	nsymbols = 0;
 
 	if (!archive(fp)) {
 		error("file format not recognized");
 		return 0;
 	}
 
 	cur = ftell(fp);
 	if ((off = armember(fp, memb)) < 0)
 		goto corrupted;
 
 	if (strcmp(memb, "/") == 0 || strcmp(memb, "__.SYMDEF") == 0)
 		cur = ftell(fp) + off;
 
 	fseek(fp, cur, SEEK_SET);
 	for (;;) {
 		cur = ftell(fp);
 		off = armember(fp, memb);
 		switch (off) {
 		case -1:
 			goto corrupted;
 		case 0:
 			return (nolib || nsymbols == 0) ? -1 : 0;
 		default:
 			membname = memb;
 			if (objprobe(fp, NULL) != -1)
 				newmember(fp);
 			membname = NULL;
 			fseek(fp, cur, SEEK_SET);
 			fseek(fp, off, SEEK_CUR);
 			break;
 		}
 	}
 
 corrupted:
 	error(strerror(errno));
 	error("library corrupted");
 	return 0;
 }
 
 static void
 merge(FILE *to, struct fprop *prop, FILE *lib, FILE *idx)
 {
 	int c;
 	struct ar_hdr first;
 
 	rewind(lib);
 	rewind(idx);
 	fseek(lib, SARMAG, SEEK_SET);
 
 	if (fread(&first, sizeof(first), 1, lib) != 1)
 		return;
 
 	if (!strncmp(first.ar_name, namidx, SARNAM))
 		fseek(lib, atol(first.ar_size), SEEK_CUR);
 	else
 		fseek(lib, SARMAG, SEEK_SET);
 
 	fwrite(ARMAG, SARMAG, 1, to);
 
         fprintf(to,
                 "%-16.16s%-12lld%-6u%-6u%-8lo%-10ld`\n",
                 namidx,
                 fromepoch(prop->time),
                 prop->uid,
                 prop->gid,
                 prop->mode,
                 prop->size);
 
 	while ((c = getc(idx)) != EOF)
 		putc(c, to);
 	if (prop->size & 1)
 		putc('\n', to);
 
 	while ((c = getc(lib)) != EOF)
 		putc(c, to);
 
 	fflush(to);
 }
 
 static void
 ranlib(char *fname)
 {
 	size_t r;
 	long *offs, i;
 	char **names;
 	FILE *fp, *idx, *out;
 	Symdef *dp;
 	struct fprop prop;
 	char tmpname[FILENAME_MAX];
 
 	filename = fname;
 	if ((fp = fopen(fname, "rb")) == NULL) {
 		error(strerror(errno));
 		return;
 	}
 
 	if (readsyms(fp) <0)
 		goto err2;
 
 	if ((idx = tmpfile()) == NULL) {
 		error(strerror(errno));
 		goto err2;
 	}
 
 	offs = malloc(sizeof(long) * nsymbols);
 	names = malloc(sizeof(*names) * nsymbols);
 	if (!offs || !names) {
 		error(strerror(errno));
 		goto err3;
 	}
 
 	for (dp = head, i = 0; i < nsymbols; dp = dp->next, i++) {
 		offs[i] = dp->offset;
 		names[i] = dp->name;
 	}
 
 	if (setindex(artype, nsymbols, names, offs, idx) < 0) {
 		error(strerror(errno));
 		goto err3;
 	}
 
 	if (getstat(fname, &prop) < 0) {
 		error(strerror(errno));
 		goto err3;
 	}
 	prop.size = ftell(idx);
 	prop.time = time(NULL);
 
 	r = snprintf(tmpname, sizeof(tmpname), "%s.tmp", fname);
 	if (r >= sizeof(tmpname)) {
 		error("too long temporary name");
 		goto err3;
 	}
 
 	if ((out = fopen(tmpname, "wb")) == NULL) {
 		error(strerror(errno));
 		goto err3;
 	}
 
 	merge(out, &prop, fp, idx);
 	if (ferror(out) || ferror(fp) || ferror(idx)) {
 		error(strerror(errno));
 		fclose(out);
 		goto err4;
 	}
 
 	fclose(out);
 	if (rename(tmpname, fname) == EOF) {
 		error(strerror(errno));
 		goto err4;
 	}
 
 err4:
 	remove(tmpname);
 err3:
 	free(offs);
 	free(names);
 	fclose(idx);
 err2:
 	freehash();
 err1:
 	fclose(fp);
 }
 
 static void
 usage(void)
 {
 	fputs("usage: ranlib [-t] file...\n", stderr);
 	exit(EXIT_FAILURE);
 }
 
 int
 main(int argc, char *argv[])
 {
 	ARGBEGIN {
 	case 't':
 		break;
 	default:
 		usage();
 	} ARGEND
 
 	if (argc == 0)
 		usage();
 
 	for (; *argv; ++argv)
 		ranlib(*argv);
 
 	return status;
 }