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minix/lib/libc/gen/getcap.c
Ben Gras 2fe8fb192f Full switch to clang/ELF. Drop ack. Simplify. 
There is important information about booting non-ack images in
docs/UPDATING. ack/aout-format images can't be built any more, and
booting clang/ELF-format ones is a little different. Updating to the
new boot monitor is recommended.

Changes in this commit:

	. drop boot monitor -> allowing dropping ack support
	. facility to copy ELF boot files to /boot so that old boot monitor
	  can still boot fairly easily, see UPDATING
	. no more ack-format libraries -> single-case libraries
	. some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases
	. drop several ack toolchain commands, but not all support
	  commands (e.g. aal is gone but acksize is not yet).
	. a few libc files moved to netbsd libc dir
	. new /bin/date as minix date used code in libc/
	. test compile fix
	. harmonize includes
	. /usr/lib is no longer special: without ack, /usr/lib plays no
	  kind of special bootstrapping role any more and bootstrapping
	  is done exclusively through packages, so releases depend even
	  less on the state of the machine making them now.
	. rename nbsd_lib* to lib*
	. reduce mtree
2012-02-14 14:52:02 +01:00

1214 lines
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/* $NetBSD: getcap.c,v 1.48 2008/02/02 20:56:46 christos Exp $ */
/*-
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Casey Leedom of Lawrence Livermore National Laboratory.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#if HAVE_NBTOOL_CONFIG_H
#include "nbtool_config.h"
#endif
#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char sccsid[] = "@(#)getcap.c 8.3 (Berkeley) 3/25/94";
#else
__RCSID("$NetBSD: getcap.c,v 1.48 2008/02/02 20:56:46 christos Exp $");
#endif
#endif /* LIBC_SCCS and not lint */
#ifndef SMALL
#include "namespace.h"
#endif
#include <sys/types.h>
#include <sys/param.h>
#include <assert.h>
#include <ctype.h>
#ifndef SMALL
#include <db.h>
#endif
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#ifdef __weak_alias
__weak_alias(cgetcap,_cgetcap)
__weak_alias(cgetclose,_cgetclose)
__weak_alias(cgetent,_cgetent)
__weak_alias(cgetfirst,_cgetfirst)
__weak_alias(cgetmatch,_cgetmatch)
__weak_alias(cgetnext,_cgetnext)
__weak_alias(cgetnum,_cgetnum)
__weak_alias(cgetset,_cgetset)
__weak_alias(cgetstr,_cgetstr)
__weak_alias(cgetustr,_cgetustr)
__weak_alias(csetexpandtc,_csetexpandtc)
#endif
#define BFRAG 1024
#define BSIZE 1024
#define ESC ('[' & 037) /* ASCII ESC */
#define MAX_RECURSION 32 /* maximum getent recursion */
#define SFRAG 100 /* cgetstr mallocs in SFRAG chunks */
#define RECOK (char)0
#define TCERR (char)1
#define SHADOW (char)2
static size_t topreclen; /* toprec length */
static char *toprec; /* Additional record specified by cgetset() */
static int gottoprec; /* Flag indicating retrieval of toprecord */
static int expandtc = 1; /* flag to expand tc= or not */
#ifndef SMALL
static int cdbget(DB *, char **, const char *);
#endif
static int getent(char **, size_t *, const char * const *, int,
const char *, int, char *);
static int nfcmp(char *, char *);
/*
* Cgetset() allows the addition of a user specified buffer to be added
* to the database array, in effect "pushing" the buffer on top of the
* virtual database. 0 is returned on success, -1 on failure.
*/
int
cgetset(const char *ent)
{
const char *source, *check;
char *dest;
if (ent == NULL) {
if (toprec != NULL)
free(toprec);
toprec = NULL;
topreclen = 0;
return 0;
}
topreclen = strlen(ent);
if ((toprec = malloc(topreclen + 1)) == NULL) {
errno = ENOMEM;
return -1;
}
gottoprec = 0;
source = ent;
dest = toprec;
while (*source != '\0') { /* Strip whitespace */
*dest++ = *source++; /* Do not check first field */
while (*source == ':') {
check = source + 1;
while (*check && (isspace((unsigned char)*check) ||
(*check=='\\' && isspace((unsigned char)check[1]))))
++check;
if (*check == ':')
source = check;
else
break;
}
}
*dest = 0;
return 0;
}
/*
* Cgetcap searches the capability record buf for the capability cap with
* type `type'. A pointer to the value of cap is returned on success, NULL
* if the requested capability couldn't be found.
*
* Specifying a type of ':' means that nothing should follow cap (:cap:).
* In this case a pointer to the terminating ':' or NUL will be returned if
* cap is found.
*
* If (cap, '@') or (cap, terminator, '@') is found before (cap, terminator)
* return NULL.
*/
char *
cgetcap(buf, cap, type)
char *buf;
const char *cap;
int type;
{
char *bp;
const char *cp;
_DIAGASSERT(buf != NULL);
_DIAGASSERT(cap != NULL);
bp = buf;
for (;;) {
/*
* Skip past the current capability field - it's either the
* name field if this is the first time through the loop, or
* the remainder of a field whose name failed to match cap.
*/
for (;;)
if (*bp == '\0')
return NULL;
else if (*bp++ == ':')
break;
/*
* Try to match (cap, type) in buf.
*/
for (cp = cap; *cp == *bp && *bp != '\0'; cp++, bp++)
continue;
if (*cp != '\0')
continue;
if (*bp == '@')
return NULL;
if (type == ':') {
if (*bp != '\0' && *bp != ':')
continue;
return bp;
}
if (*bp != type)
continue;
bp++;
return *bp == '@' ? NULL : bp;
}
/* NOTREACHED */
}
/*
* Cgetent extracts the capability record name from the NULL terminated file
* array db_array and returns a pointer to a malloc'd copy of it in buf.
* Buf must be retained through all subsequent calls to cgetcap, cgetnum,
* cgetflag, and cgetstr, but may then be free'd. 0 is returned on success,
* -1 if the requested record couldn't be found, -2 if a system error was
* encountered (couldn't open/read a file, etc.), and -3 if a potential
* reference loop is detected.
*/
/* coverity[+alloc : arg-*0] */
int
cgetent(char **buf, const char * const *db_array, const char *name)
{
size_t dummy;
_DIAGASSERT(buf != NULL);
_DIAGASSERT(db_array != NULL);
_DIAGASSERT(name != NULL);
return getent(buf, &dummy, db_array, -1, name, 0, NULL);
}
void
csetexpandtc(int etc)
{
expandtc = etc;
}
/*
* Getent implements the functions of cgetent. If fd is non-negative,
* *db_array has already been opened and fd is the open file descriptor. We
* do this to save time and avoid using up file descriptors for tc=
* recursions.
*
* Getent returns the same success/failure codes as cgetent. On success, a
* pointer to a malloc'ed capability record with all tc= capabilities fully
* expanded and its length (not including trailing ASCII NUL) are left in
* *cap and *len.
*
* Basic algorithm:
* + Allocate memory incrementally as needed in chunks of size BFRAG
* for capability buffer.
* + Recurse for each tc=name and interpolate result. Stop when all
* names interpolated, a name can't be found, or depth exceeds
* MAX_RECURSION.
*/
/* coverity[+alloc : arg-*0] */
static int
getent(char **cap, size_t *len, const char * const *db_array, int fd,
const char *name, int depth, char *nfield)
{
#ifndef SMALL
DB *capdbp;
char pbuf[MAXPATHLEN];
char *cbuf;
int retval;
size_t clen;
#endif
char *record, *newrecord;
char *r_end, *rp; /* pacify gcc */
const char * const *db_p;
int myfd, eof, foundit;
int tc_not_resolved;
_DIAGASSERT(cap != NULL);
_DIAGASSERT(len != NULL);
_DIAGASSERT(db_array != NULL);
/* fd may be -1 */
_DIAGASSERT(name != NULL);
/* nfield may be NULL */
myfd = 0;
rp = NULL;
/*
* Return with ``loop detected'' error if we've recursed more than
* MAX_RECURSION times.
*/
if (depth > MAX_RECURSION)
return -3;
/*
* Check if we have a top record from cgetset().
*/
if (depth == 0 && toprec != NULL && cgetmatch(toprec, name) == 0) {
if ((record = malloc(topreclen + BFRAG)) == NULL) {
errno = ENOMEM;
return -2;
}
(void)strcpy(record, toprec); /* XXX: strcpy is safe */
db_p = db_array;
rp = record + topreclen + 1;
r_end = rp + BFRAG;
goto tc_exp;
}
/*
* Allocate first chunk of memory.
*/
if ((record = malloc(BFRAG)) == NULL) {
errno = ENOMEM;
return -2;
}
r_end = record + BFRAG;
foundit = 0;
/*
* Loop through database array until finding the record.
*/
for (db_p = db_array; *db_p != NULL; db_p++) {
eof = 0;
/*
* Open database if not already open.
*/
if (fd >= 0) {
(void)lseek(fd, (off_t)0, SEEK_SET);
} else {
#ifndef SMALL
(void)snprintf(pbuf, sizeof(pbuf), "%s.db", *db_p);
if (expandtc &&
(capdbp = dbopen(pbuf, O_RDONLY, 0, DB_HASH, 0))
!= NULL) {
free(record);
retval = cdbget(capdbp, &record, name);
if (retval < 0) {
/* no record available */
(void)capdbp->close(capdbp);
return retval;
}
/* save the data; close frees it */
clen = strlen(record);
if ((cbuf = malloc(clen + 1)) == NULL) {
(void)capdbp->close(capdbp);
errno = ENOMEM;
return -2;
}
memmove(cbuf, record, clen + 1);
if (capdbp->close(capdbp) < 0) {
int serrno = errno;
free(cbuf);
errno = serrno;
return -2;
}
*len = clen;
*cap = cbuf;
return retval;
} else
#endif
{
fd = open(*db_p, O_RDONLY, 0);
if (fd < 0) {
/* No error on unfound file. */
continue;
}
myfd = 1;
}
}
/*
* Find the requested capability record ...
*/
{
char buf[BUFSIZ];
char *b_end, *bp, *cp;
int c, slash;
/*
* Loop invariants:
* There is always room for one more character in record.
* R_end always points just past end of record.
* Rp always points just past last character in record.
* B_end always points just past last character in buf.
* Bp always points at next character in buf.
* Cp remembers where the last colon was.
*/
b_end = buf;
bp = buf;
cp = NULL;
slash = 0;
for (;;) {
/*
* Read in a line implementing (\, newline)
* line continuation.
*/
rp = record;
for (;;) {
if (bp >= b_end) {
int n;
n = read(fd, buf, sizeof(buf));
if (n <= 0) {
if (myfd)
(void)close(fd);
if (n < 0) {
int serrno = errno;
free(record);
errno = serrno;
return -2;
} else {
fd = -1;
eof = 1;
break;
}
}
b_end = buf+n;
bp = buf;
}
c = *bp++;
if (c == '\n') {
if (slash) {
slash = 0;
rp--;
continue;
} else
break;
}
if (slash) {
slash = 0;
cp = 0;
}
if (c == ':') {
/*
* If the field was `empty' (i.e.
* contained only white space), back up
* to the colon (eliminating the
* field).
*/
if (cp != NULL)
rp = cp;
else
cp = rp;
} else if (c == '\\') {
slash = 1;
} else if (c != ' ' && c != '\t') {
/*
* Forget where the colon was, as this
* is not an empty field.
*/
cp = 0;
}
*rp++ = c;
/*
* Enforce loop invariant: if no room
* left in record buffer, try to get
* some more.
*/
if (rp >= r_end) {
u_int pos;
size_t newsize;
pos = rp - record;
newsize = r_end - record + BFRAG;
newrecord = realloc(record, newsize);
if (newrecord == NULL) {
free(record);
if (myfd)
(void)close(fd);
errno = ENOMEM;
return -2;
}
record = newrecord;
r_end = record + newsize;
rp = record + pos;
}
}
/* Eliminate any white space after the last colon. */
if (cp)
rp = cp + 1;
/* Loop invariant lets us do this. */
*rp++ = '\0';
/*
* If encountered eof check next file.
*/
if (eof)
break;
/*
* Toss blank lines and comments.
*/
if (*record == '\0' || *record == '#')
continue;
/*
* See if this is the record we want ...
*/
if (cgetmatch(record, name) == 0)
if (nfield == NULL || !nfcmp(nfield, record)) {
foundit = 1;
break; /* found it! */
}
}
}
if (foundit)
break;
}
if (!foundit)
return -1;
/*
* Got the capability record, but now we have to expand all tc=name
* references in it ...
*/
tc_exp:
tc_not_resolved = 0;
if (expandtc) {
char *newicap, *s;
size_t ilen, newilen;
int diff, iret, tclen;
char *icap, *scan, *tc, *tcstart, *tcend;
/*
* Loop invariants:
* There is room for one more character in record.
* R_end points just past end of record.
* Rp points just past last character in record.
* Scan points at remainder of record that needs to be
* scanned for tc=name constructs.
*/
scan = record;
for (;;) {
if ((tc = cgetcap(scan, "tc", '=')) == NULL)
break;
/*
* Find end of tc=name and stomp on the trailing `:'
* (if present) so we can use it to call ourselves.
*/
s = tc;
for (;;)
if (*s == '\0')
break;
else
if (*s++ == ':') {
*(s - 1) = '\0';
break;
}
tcstart = tc - 3;
tclen = s - tcstart;
tcend = s;
iret = getent(&icap, &ilen, db_p, fd, tc, depth+1,
NULL);
newicap = icap; /* Put into a register. */
newilen = ilen;
if (iret != 0) {
/* an error */
if (iret < -1) {
if (myfd)
(void)close(fd);
free(record);
return iret;
}
if (iret == 1)
tc_not_resolved = 1;
/* couldn't resolve tc */
if (iret == -1) {
*(s - 1) = ':';
scan = s - 1;
tc_not_resolved = 1;
continue;
}
}
/* not interested in name field of tc'ed record */
s = newicap;
for (;;)
if (*s == '\0')
break;
else if (*s++ == ':')
break;
newilen -= s - newicap;
newicap = s;
/* make sure interpolated record is `:'-terminated */
s += newilen;
if (*(s - 1) != ':') {
*s = ':'; /* overwrite NUL with : */
newilen++;
}
/*
* Make sure there's enough room to insert the
* new record.
*/
diff = newilen - tclen;
if (diff >= r_end - rp) {
u_int pos, tcpos, tcposend;
size_t newsize;
pos = rp - record;
newsize = r_end - record + diff + BFRAG;
tcpos = tcstart - record;
tcposend = tcend - record;
newrecord = realloc(record, newsize);
if (newrecord == NULL) {
free(record);
if (myfd)
(void)close(fd);
free(icap);
errno = ENOMEM;
return -2;
}
record = newrecord;
r_end = record + newsize;
rp = record + pos;
tcstart = record + tcpos;
tcend = record + tcposend;
}
/*
* Insert tc'ed record into our record.
*/
s = tcstart + newilen;
memmove(s, tcend, (size_t)(rp - tcend));
memmove(tcstart, newicap, newilen);
rp += diff;
free(icap);
/*
* Start scan on `:' so next cgetcap works properly
* (cgetcap always skips first field).
*/
scan = s - 1;
}
}
/*
* Close file (if we opened it), give back any extra memory, and
* return capability, length and success.
*/
if (myfd)
(void)close(fd);
*len = rp - record - 1; /* don't count NUL */
if (r_end > rp) {
if ((newrecord =
realloc(record, (size_t)(rp - record))) == NULL) {
free(record);
errno = ENOMEM;
return -2;
}
record = newrecord;
}
*cap = record;
if (tc_not_resolved)
return 1;
return 0;
}
#ifndef SMALL
static int
cdbget(DB *capdbp, char **bp, const char *name)
{
DBT key;
DBT data;
_DIAGASSERT(capdbp != NULL);
_DIAGASSERT(bp != NULL);
_DIAGASSERT(name != NULL);
key.data = __UNCONST(name);
key.size = strlen(name);
for (;;) {
/* Get the reference. */
switch(capdbp->get(capdbp, &key, &data, 0)) {
case -1:
return -2;
case 1:
return -1;
}
/* If not an index to another record, leave. */
if (((char *)data.data)[0] != SHADOW)
break;
key.data = (char *)data.data + 1;
key.size = data.size - 1;
}
*bp = (char *)data.data + 1;
return ((char *)(data.data))[0] == TCERR ? 1 : 0;
}
#endif
/*
* Cgetmatch will return 0 if name is one of the names of the capability
* record buf, -1 if not.
*/
int
cgetmatch(const char *buf, const char *name)
{
const char *np, *bp;
_DIAGASSERT(buf != NULL);
_DIAGASSERT(name != NULL);
/*
* Start search at beginning of record.
*/
bp = buf;
for (;;) {
/*
* Try to match a record name.
*/
np = name;
for (;;)
if (*np == '\0') {
if (*bp == '|' || *bp == ':' || *bp == '\0')
return 0;
else
break;
} else if (*bp++ != *np++)
break;
/*
* Match failed, skip to next name in record.
*/
if (bp > buf)
bp--; /* a '|' or ':' may have stopped the match */
else
return -1;
for (;;)
if (*bp == '\0' || *bp == ':')
return -1; /* match failed totally */
else if (*bp++ == '|')
break; /* found next name */
}
}
int
cgetfirst(char **buf, const char * const *db_array)
{
_DIAGASSERT(buf != NULL);
_DIAGASSERT(db_array != NULL);
(void)cgetclose();
return cgetnext(buf, db_array);
}
static FILE *pfp;
static int slash;
static const char * const *dbp;
int
cgetclose(void)
{
if (pfp != NULL) {
(void)fclose(pfp);
pfp = NULL;
}
dbp = NULL;
gottoprec = 0;
slash = 0;
return 0;
}
/*
* Cgetnext() gets either the first or next entry in the logical database
* specified by db_array. It returns 0 upon completion of the database, 1
* upon returning an entry with more remaining, and -1 if an error occurs.
*/
/* coverity[+alloc : arg-*0] */
int
cgetnext(char **bp, const char * const *db_array)
{
size_t len = 0;
int status, done;
char *cp, *line, *rp, *np, buf[BSIZE], nbuf[BSIZE];
size_t dummy;
_DIAGASSERT(bp != NULL);
_DIAGASSERT(db_array != NULL);
if (dbp == NULL)
dbp = db_array;
if (pfp == NULL && (pfp = fopen(*dbp, "r")) == NULL) {
(void)cgetclose();
return -1;
}
for (;;) {
if (toprec != NULL && !gottoprec) {
gottoprec = 1;
line = toprec;
} else {
line = fgetln(pfp, &len);
if (line == NULL) {
if (pfp == NULL)
return -1;
if (ferror(pfp)) {
(void)cgetclose();
return -1;
} else {
(void)fclose(pfp);
pfp = NULL;
if (*++dbp == NULL) {
(void)cgetclose();
return 0;
} else if ((pfp =
fopen(*dbp, "r")) == NULL) {
(void)cgetclose();
return -1;
} else
continue;
}
} else
line[len - 1] = '\0';
if (len == 1) {
slash = 0;
continue;
}
if (isspace((unsigned char)*line) ||
*line == ':' || *line == '#' || slash) {
if (line[len - 2] == '\\')
slash = 1;
else
slash = 0;
continue;
}
if (line[len - 2] == '\\')
slash = 1;
else
slash = 0;
}
/*
* Line points to a name line.
*/
if (len > sizeof(nbuf))
return -1;
done = 0;
np = nbuf;
for (;;) {
for (cp = line; *cp != '\0'; cp++) {
if (*cp == ':') {
*np++ = ':';
done = 1;
break;
}
if (*cp == '\\')
break;
*np++ = *cp;
}
if (done) {
*np = '\0';
break;
} else { /* name field extends beyond the line */
line = fgetln(pfp, &len);
if (line == NULL && pfp) {
if (ferror(pfp)) {
(void)cgetclose();
return -1;
}
(void)fclose(pfp);
pfp = NULL;
*np = '\0';
break;
} else
line[len - 1] = '\0';
}
}
if (len > sizeof(buf))
return -1;
rp = buf;
for (cp = nbuf; *cp != '\0'; cp++)
if (*cp == '|' || *cp == ':')
break;
else
*rp++ = *cp;
*rp = '\0';
/*
* XXX
* Last argument of getent here should be nbuf if we want true
* sequential access in the case of duplicates.
* With NULL, getent will return the first entry found
* rather than the duplicate entry record. This is a
* matter of semantics that should be resolved.
*/
status = getent(bp, &dummy, db_array, -1, buf, 0, NULL);
if (status == -2 || status == -3)
(void)cgetclose();
return status + 1;
}
/* NOTREACHED */
}
/*
* Cgetstr retrieves the value of the string capability cap from the
* capability record pointed to by buf. A pointer to a decoded, NUL
* terminated, malloc'd copy of the string is returned in the char *
* pointed to by str. The length of the string not including the trailing
* NUL is returned on success, -1 if the requested string capability
* couldn't be found, -2 if a system error was encountered (storage
* allocation failure).
*/
int
cgetstr(char *buf, const char *cap, char **str)
{
u_int m_room;
const char *bp;
char *mp;
int len;
char *mem, *newmem;
_DIAGASSERT(buf != NULL);
_DIAGASSERT(cap != NULL);
_DIAGASSERT(str != NULL);
/*
* Find string capability cap
*/
bp = cgetcap(buf, cap, '=');
if (bp == NULL)
return -1;
/*
* Conversion / storage allocation loop ... Allocate memory in
* chunks SFRAG in size.
*/
if ((mem = malloc(SFRAG)) == NULL) {
errno = ENOMEM;
return -2; /* couldn't even allocate the first fragment */
}
m_room = SFRAG;
mp = mem;
while (*bp != ':' && *bp != '\0') {
/*
* Loop invariants:
* There is always room for one more character in mem.
* Mp always points just past last character in mem.
* Bp always points at next character in buf.
*/
if (*bp == '^') {
bp++;
if (*bp == ':' || *bp == '\0')
break; /* drop unfinished escape */
*mp++ = *bp++ & 037;
} else if (*bp == '\\') {
bp++;
if (*bp == ':' || *bp == '\0')
break; /* drop unfinished escape */
if ('0' <= *bp && *bp <= '7') {
int n, i;
n = 0;
i = 3; /* maximum of three octal digits */
do {
n = n * 8 + (*bp++ - '0');
} while (--i && '0' <= *bp && *bp <= '7');
*mp++ = n;
}
else switch (*bp++) {
case 'b': case 'B':
*mp++ = '\b';
break;
case 't': case 'T':
*mp++ = '\t';
break;
case 'n': case 'N':
*mp++ = '\n';
break;
case 'f': case 'F':
*mp++ = '\f';
break;
case 'r': case 'R':
*mp++ = '\r';
break;
case 'e': case 'E':
*mp++ = ESC;
break;
case 'c': case 'C':
*mp++ = ':';
break;
default:
/*
* Catches '\', '^', and
* everything else.
*/
*mp++ = *(bp-1);
break;
}
} else
*mp++ = *bp++;
m_room--;
/*
* Enforce loop invariant: if no room left in current
* buffer, try to get some more.
*/
if (m_room == 0) {
size_t size = mp - mem;
if ((newmem = realloc(mem, size + SFRAG)) == NULL) {
free(mem);
return -2;
}
mem = newmem;
m_room = SFRAG;
mp = mem + size;
}
}
*mp++ = '\0'; /* loop invariant let's us do this */
m_room--;
len = mp - mem - 1;
/*
* Give back any extra memory and return value and success.
*/
if (m_room != 0) {
if ((newmem = realloc(mem, (size_t)(mp - mem))) == NULL) {
free(mem);
return -2;
}
mem = newmem;
}
*str = mem;
return len;
}
/*
* Cgetustr retrieves the value of the string capability cap from the
* capability record pointed to by buf. The difference between cgetustr()
* and cgetstr() is that cgetustr does not decode escapes but rather treats
* all characters literally. A pointer to a NUL terminated malloc'd
* copy of the string is returned in the char pointed to by str. The
* length of the string not including the trailing NUL is returned on success,
* -1 if the requested string capability couldn't be found, -2 if a system
* error was encountered (storage allocation failure).
*/
int
cgetustr(char *buf, const char *cap, char **str)
{
u_int m_room;
const char *bp;
char *mp;
int len;
char *mem, *newmem;
_DIAGASSERT(buf != NULL);
_DIAGASSERT(cap != NULL);
_DIAGASSERT(str != NULL);
/*
* Find string capability cap
*/
if ((bp = cgetcap(buf, cap, '=')) == NULL)
return -1;
/*
* Conversion / storage allocation loop ... Allocate memory in
* chunks SFRAG in size.
*/
if ((mem = malloc(SFRAG)) == NULL) {
errno = ENOMEM;
return -2; /* couldn't even allocate the first fragment */
}
m_room = SFRAG;
mp = mem;
while (*bp != ':' && *bp != '\0') {
/*
* Loop invariants:
* There is always room for one more character in mem.
* Mp always points just past last character in mem.
* Bp always points at next character in buf.
*/
*mp++ = *bp++;
m_room--;
/*
* Enforce loop invariant: if no room left in current
* buffer, try to get some more.
*/
if (m_room == 0) {
size_t size = mp - mem;
if ((newmem = realloc(mem, size + SFRAG)) == NULL) {
free(mem);
return -2;
}
mem = newmem;
m_room = SFRAG;
mp = mem + size;
}
}
*mp++ = '\0'; /* loop invariant let's us do this */
m_room--;
len = mp - mem - 1;
/*
* Give back any extra memory and return value and success.
*/
if (m_room != 0) {
if ((newmem = realloc(mem, (size_t)(mp - mem))) == NULL) {
free(mem);
return -2;
}
mem = newmem;
}
*str = mem;
return len;
}
/*
* Cgetnum retrieves the value of the numeric capability cap from the
* capability record pointed to by buf. The numeric value is returned in
* the long pointed to by num. 0 is returned on success, -1 if the requested
* numeric capability couldn't be found.
*/
int
cgetnum(char *buf, const char *cap, long *num)
{
long n;
int base, digit;
const char *bp;
_DIAGASSERT(buf != NULL);
_DIAGASSERT(cap != NULL);
_DIAGASSERT(num != NULL);
/*
* Find numeric capability cap
*/
bp = cgetcap(buf, cap, '#');
if (bp == NULL)
return -1;
/*
* Look at value and determine numeric base:
* 0x... or 0X... hexadecimal,
* else 0... octal,
* else decimal.
*/
if (*bp == '0') {
bp++;
if (*bp == 'x' || *bp == 'X') {
bp++;
base = 16;
} else
base = 8;
} else
base = 10;
/*
* Conversion loop ...
*/
n = 0;
for (;;) {
if ('0' <= *bp && *bp <= '9')
digit = *bp - '0';
else if ('a' <= *bp && *bp <= 'f')
digit = 10 + *bp - 'a';
else if ('A' <= *bp && *bp <= 'F')
digit = 10 + *bp - 'A';
else
break;
if (digit >= base)
break;
n = n * base + digit;
bp++;
}
/*
* Return value and success.
*/
*num = n;
return 0;
}
/*
* Compare name field of record.
*/
static int
nfcmp(char *nf, char *rec)
{
char *cp, tmp;
int ret;
_DIAGASSERT(nf != NULL);
_DIAGASSERT(rec != NULL);
for (cp = rec; *cp != ':'; cp++)
continue;
tmp = *(cp + 1);
*(cp + 1) = '\0';
ret = strcmp(nf, rec);
*(cp + 1) = tmp;
return ret;
}
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