From: Philip Homburg Date: Mon, 11 Jul 2005 13:06:27 +0000 (+0000) Subject: Added random, strdup, and strtok_r. X-Git-Tag: v3.1.0~630 X-Git-Url: http://zhaoyanbai.com/repos/doc/tz-art.htm?a=commitdiff_plain;h=b5809b6a81a12a22c2e08e51a3d832d2c474b577;p=minix.git Added random, strdup, and strtok_r. --- diff --git a/lib/other/Makefile b/lib/other/Makefile index 724448ef5..35af0c48e 100755 --- a/lib/other/Makefile +++ b/lib/other/Makefile @@ -52,9 +52,12 @@ OBJECTS = \ $(LIBRARY)(popen.o) \ $(LIBRARY)(putenv.o) \ $(LIBRARY)(putw.o) \ + $(LIBRARY)(random.o) \ $(LIBRARY)(setgroups.o) \ $(LIBRARY)(settimeofday.o) \ $(LIBRARY)(stderr.o) \ + $(LIBRARY)(strdup.o) \ + $(LIBRARY)(strtok_r.o) \ $(LIBRARY)(swab.o) \ $(LIBRARY)(syscall.o) \ $(LIBRARY)(sysconf.o) \ @@ -210,6 +213,9 @@ $(LIBRARY)(putw.o): putw.c $(LIBRARY)(rindex.o): rindex.c $(CC1) rindex.c +$(LIBRARY)(random.o): random.c + $(CC1) random.c + $(LIBRARY)(setgroups.o): setgroups.c $(CC1) setgroups.c @@ -219,6 +225,12 @@ $(LIBRARY)(settimeofday.o): settimeofday.c $(LIBRARY)(stderr.o): stderr.c $(CC1) stderr.c +$(LIBRARY)(strdup.o): strdup.c + $(CC1) strdup.c + +$(LIBRARY)(strtok_r.o): strtok_r.c + $(CC1) strtok_r.c + $(LIBRARY)(swab.o): swab.c $(CC1) swab.c @@ -248,3 +260,6 @@ $(LIBRARY)(v8regexp.o): v8regexp.c $(LIBRARY)(v8regsub.o): v8regsub.c $(CC1) v8regsub.c + +$(LIBRARY)(writev.o): writev.c + $(CC1) writev.c diff --git a/lib/other/random.c b/lib/other/random.c new file mode 100644 index 000000000..ef8df6ee2 --- /dev/null +++ b/lib/other/random.c @@ -0,0 +1,363 @@ +/* + * Copyright (c) 1983, 1993 + * The Regents of the University of California. All rights reserved. + * + * 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. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. 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 defined(LIBC_SCCS) && !defined(lint) +static char sccsid[] = "@(#)random.c 8.1 (Berkeley) 6/4/93"; +#endif /* LIBC_SCCS and not lint */ + +#include +#include + +/* + * random.c: + * + * An improved random number generation package. In addition to the standard + * rand()/srand() like interface, this package also has a special state info + * interface. The initstate() routine is called with a seed, an array of + * bytes, and a count of how many bytes are being passed in; this array is + * then initialized to contain information for random number generation with + * that much state information. Good sizes for the amount of state + * information are 32, 64, 128, and 256 bytes. The state can be switched by + * calling the setstate() routine with the same array as was initiallized + * with initstate(). By default, the package runs with 128 bytes of state + * information and generates far better random numbers than a linear + * congruential generator. If the amount of state information is less than + * 32 bytes, a simple linear congruential R.N.G. is used. + * + * Internally, the state information is treated as an array of longs; the + * zeroeth element of the array is the type of R.N.G. being used (small + * integer); the remainder of the array is the state information for the + * R.N.G. Thus, 32 bytes of state information will give 7 longs worth of + * state information, which will allow a degree seven polynomial. (Note: + * the zeroeth word of state information also has some other information + * stored in it -- see setstate() for details). + * + * The random number generation technique is a linear feedback shift register + * approach, employing trinomials (since there are fewer terms to sum up that + * way). In this approach, the least significant bit of all the numbers in + * the state table will act as a linear feedback shift register, and will + * have period 2^deg - 1 (where deg is the degree of the polynomial being + * used, assuming that the polynomial is irreducible and primitive). The + * higher order bits will have longer periods, since their values are also + * influenced by pseudo-random carries out of the lower bits. The total + * period of the generator is approximately deg*(2**deg - 1); thus doubling + * the amount of state information has a vast influence on the period of the + * generator. Note: the deg*(2**deg - 1) is an approximation only good for + * large deg, when the period of the shift register is the dominant factor. + * With deg equal to seven, the period is actually much longer than the + * 7*(2**7 - 1) predicted by this formula. + */ + +/* + * For each of the currently supported random number generators, we have a + * break value on the amount of state information (you need at least this + * many bytes of state info to support this random number generator), a degree + * for the polynomial (actually a trinomial) that the R.N.G. is based on, and + * the separation between the two lower order coefficients of the trinomial. + */ +#define TYPE_0 0 /* linear congruential */ +#define BREAK_0 8 +#define DEG_0 0 +#define SEP_0 0 + +#define TYPE_1 1 /* x**7 + x**3 + 1 */ +#define BREAK_1 32 +#define DEG_1 7 +#define SEP_1 3 + +#define TYPE_2 2 /* x**15 + x + 1 */ +#define BREAK_2 64 +#define DEG_2 15 +#define SEP_2 1 + +#define TYPE_3 3 /* x**31 + x**3 + 1 */ +#define BREAK_3 128 +#define DEG_3 31 +#define SEP_3 3 + +#define TYPE_4 4 /* x**63 + x + 1 */ +#define BREAK_4 256 +#define DEG_4 63 +#define SEP_4 1 + +/* + * Array versions of the above information to make code run faster -- + * relies on fact that TYPE_i == i. + */ +#define MAX_TYPES 5 /* max number of types above */ + +static int degrees[MAX_TYPES] = { DEG_0, DEG_1, DEG_2, DEG_3, DEG_4 }; +static int seps [MAX_TYPES] = { SEP_0, SEP_1, SEP_2, SEP_3, SEP_4 }; + +/* + * Initially, everything is set up as if from: + * + * initstate(1, &randtbl, 128); + * + * Note that this initialization takes advantage of the fact that srandom() + * advances the front and rear pointers 10*rand_deg times, and hence the + * rear pointer which starts at 0 will also end up at zero; thus the zeroeth + * element of the state information, which contains info about the current + * position of the rear pointer is just + * + * MAX_TYPES * (rptr - state) + TYPE_3 == TYPE_3. + */ + +static long randtbl[DEG_3 + 1] = { + TYPE_3, + 0x9a319039, 0x32d9c024, 0x9b663182, 0x5da1f342, 0xde3b81e0, 0xdf0a6fb5, + 0xf103bc02, 0x48f340fb, 0x7449e56b, 0xbeb1dbb0, 0xab5c5918, 0x946554fd, + 0x8c2e680f, 0xeb3d799f, 0xb11ee0b7, 0x2d436b86, 0xda672e2a, 0x1588ca88, + 0xe369735d, 0x904f35f7, 0xd7158fd6, 0x6fa6f051, 0x616e6b96, 0xac94efdc, + 0x36413f93, 0xc622c298, 0xf5a42ab8, 0x8a88d77b, 0xf5ad9d0e, 0x8999220b, + 0x27fb47b9, +}; + +/* + * fptr and rptr are two pointers into the state info, a front and a rear + * pointer. These two pointers are always rand_sep places aparts, as they + * cycle cyclically through the state information. (Yes, this does mean we + * could get away with just one pointer, but the code for random() is more + * efficient this way). The pointers are left positioned as they would be + * from the call + * + * initstate(1, randtbl, 128); + * + * (The position of the rear pointer, rptr, is really 0 (as explained above + * in the initialization of randtbl) because the state table pointer is set + * to point to randtbl[1] (as explained below). + */ +static long *fptr = &randtbl[SEP_3 + 1]; +static long *rptr = &randtbl[1]; + +/* + * The following things are the pointer to the state information table, the + * type of the current generator, the degree of the current polynomial being + * used, and the separation between the two pointers. Note that for efficiency + * of random(), we remember the first location of the state information, not + * the zeroeth. Hence it is valid to access state[-1], which is used to + * store the type of the R.N.G. Also, we remember the last location, since + * this is more efficient than indexing every time to find the address of + * the last element to see if the front and rear pointers have wrapped. + */ +static long *state = &randtbl[1]; +static int rand_type = TYPE_3; +static int rand_deg = DEG_3; +static int rand_sep = SEP_3; +static long *end_ptr = &randtbl[DEG_3 + 1]; + +/* + * srandom: + * + * Initialize the random number generator based on the given seed. If the + * type is the trivial no-state-information type, just remember the seed. + * Otherwise, initializes state[] based on the given "seed" via a linear + * congruential generator. Then, the pointers are set to known locations + * that are exactly rand_sep places apart. Lastly, it cycles the state + * information a given number of times to get rid of any initial dependencies + * introduced by the L.C.R.N.G. Note that the initialization of randtbl[] + * for default usage relies on values produced by this routine. + */ +void +srandom(x) + u_int x; +{ + register int i, j; + + if (rand_type == TYPE_0) + state[0] = x; + else { + j = 1; + state[0] = x; + for (i = 1; i < rand_deg; i++) + state[i] = 1103515245 * state[i - 1] + 12345; + fptr = &state[rand_sep]; + rptr = &state[0]; + for (i = 0; i < 10 * rand_deg; i++) + (void)random(); + } +} + +/* + * initstate: + * + * Initialize the state information in the given array of n bytes for future + * random number generation. Based on the number of bytes we are given, and + * the break values for the different R.N.G.'s, we choose the best (largest) + * one we can and set things up for it. srandom() is then called to + * initialize the state information. + * + * Note that on return from srandom(), we set state[-1] to be the type + * multiplexed with the current value of the rear pointer; this is so + * successive calls to initstate() won't lose this information and will be + * able to restart with setstate(). + * + * Note: the first thing we do is save the current state, if any, just like + * setstate() so that it doesn't matter when initstate is called. + * + * Returns a pointer to the old state. + */ +char * +initstate(seed, arg_state, n) + u_int seed; /* seed for R.N.G. */ + char *arg_state; /* pointer to state array */ + size_t n; /* # bytes of state info */ +{ + register char *ostate = (char *)(&state[-1]); + + if (rand_type == TYPE_0) + state[-1] = rand_type; + else + state[-1] = MAX_TYPES * (rptr - state) + rand_type; + if (n < BREAK_0) { + (void)fprintf(stderr, + "random: not enough state (%d bytes); ignored.\n", n); + return(0); + } + if (n < BREAK_1) { + rand_type = TYPE_0; + rand_deg = DEG_0; + rand_sep = SEP_0; + } else if (n < BREAK_2) { + rand_type = TYPE_1; + rand_deg = DEG_1; + rand_sep = SEP_1; + } else if (n < BREAK_3) { + rand_type = TYPE_2; + rand_deg = DEG_2; + rand_sep = SEP_2; + } else if (n < BREAK_4) { + rand_type = TYPE_3; + rand_deg = DEG_3; + rand_sep = SEP_3; + } else { + rand_type = TYPE_4; + rand_deg = DEG_4; + rand_sep = SEP_4; + } + state = &(((long *)arg_state)[1]); /* first location */ + end_ptr = &state[rand_deg]; /* must set end_ptr before srandom */ + srandom(seed); + if (rand_type == TYPE_0) + state[-1] = rand_type; + else + state[-1] = MAX_TYPES*(rptr - state) + rand_type; + return(ostate); +} + +/* + * setstate: + * + * Restore the state from the given state array. + * + * Note: it is important that we also remember the locations of the pointers + * in the current state information, and restore the locations of the pointers + * from the old state information. This is done by multiplexing the pointer + * location into the zeroeth word of the state information. + * + * Note that due to the order in which things are done, it is OK to call + * setstate() with the same state as the current state. + * + * Returns a pointer to the old state information. + */ +char * +setstate(arg_state) + const char *arg_state; +{ + register long *new_state = (long *)arg_state; + register int type = new_state[0] % MAX_TYPES; + register int rear = new_state[0] / MAX_TYPES; + char *ostate = (char *)(&state[-1]); + + if (rand_type == TYPE_0) + state[-1] = rand_type; + else + state[-1] = MAX_TYPES * (rptr - state) + rand_type; + switch(type) { + case TYPE_0: + case TYPE_1: + case TYPE_2: + case TYPE_3: + case TYPE_4: + rand_type = type; + rand_deg = degrees[type]; + rand_sep = seps[type]; + break; + default: + (void)fprintf(stderr, + "random: state info corrupted; not changed.\n"); + } + state = &new_state[1]; + if (rand_type != TYPE_0) { + rptr = &state[rear]; + fptr = &state[(rear + rand_sep) % rand_deg]; + } + end_ptr = &state[rand_deg]; /* set end_ptr too */ + return(ostate); +} + +/* + * random: + * + * If we are using the trivial TYPE_0 R.N.G., just do the old linear + * congruential bit. Otherwise, we do our fancy trinomial stuff, which is + * the same in all the other cases due to all the global variables that have + * been set up. The basic operation is to add the number at the rear pointer + * into the one at the front pointer. Then both pointers are advanced to + * the next location cyclically in the table. The value returned is the sum + * generated, reduced to 31 bits by throwing away the "least random" low bit. + * + * Note: the code takes advantage of the fact that both the front and + * rear pointers can't wrap on the same call by not testing the rear + * pointer if the front one has wrapped. + * + * Returns a 31-bit random number. + */ +long +random() +{ + long i; + + if (rand_type == TYPE_0) + i = state[0] = (state[0] * 1103515245 + 12345) & 0x7fffffff; + else { + *fptr += *rptr; + i = (*fptr >> 1) & 0x7fffffff; /* chucking least random bit */ + if (++fptr >= end_ptr) { + fptr = state; + ++rptr; + } else if (++rptr >= end_ptr) + rptr = state; + } + return(i); +} diff --git a/lib/other/strdup.c b/lib/other/strdup.c new file mode 100644 index 000000000..62969cbaa --- /dev/null +++ b/lib/other/strdup.c @@ -0,0 +1,23 @@ +/* +lib/other/strdup.c +*/ + +#include +#include + +char *strdup(s1) +const char *s1; +{ + size_t len; + char *s2; + + len= strlen(s1)+1; + + s2= malloc(len); + if (s2 == NULL) + return NULL; + strcpy(s2, s1); + + return s2; +} + diff --git a/lib/other/strtok_r.c b/lib/other/strtok_r.c new file mode 100644 index 000000000..bcfbc6b5f --- /dev/null +++ b/lib/other/strtok_r.c @@ -0,0 +1,169 @@ +/* + * Copyright (c) 1998 Softweyr LLC. All rights reserved. + * + * strtok_r, from Berkeley strtok + * Oct 13, 1998 by Wes Peters + * + * Copyright (c) 1988, 1993 + * The Regents of the University of California. All rights reserved. + * + * 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 + * notices, this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright + * notices, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * + * This product includes software developed by Softweyr LLC, the + * University of California, Berkeley, and its contributors. + * + * 4. 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 SOFTWEYR LLC, 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 SOFTWEYR LLC, 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. + */ + +#ifndef lint +static const char rcsid[] = + "$FreeBSD: src/lib/libc/string/strtok.c,v 1.2.6.1 2001/07/09 23:30:07 obrien Exp $"; +#endif + +#include +#include + +char * +strtok_r(char *s, const char *delim, char **last) +{ + char *spanp; + int c, sc; + char *tok; + + if (s == NULL && (s = *last) == NULL) + { + return NULL; + } + + /* + * Skip (span) leading delimiters (s += strspn(s, delim), sort of). + */ +cont: + c = *s++; + for (spanp = (char *)delim; (sc = *spanp++) != 0; ) + { + if (c == sc) + { + goto cont; + } + } + + if (c == 0) /* no non-delimiter characters */ + { + *last = NULL; + return NULL; + } + tok = s - 1; + + /* + * Scan token (scan for delimiters: s += strcspn(s, delim), sort of). + * Note that delim must have one NUL; we stop if we see that, too. + */ + for (;;) + { + c = *s++; + spanp = (char *)delim; + do + { + if ((sc = *spanp++) == c) + { + if (c == 0) + { + s = NULL; + } + else + { + char *w = s - 1; + *w = '\0'; + } + *last = s; + return tok; + } + } + while (sc != 0); + } + /* NOTREACHED */ +} + + +#if 0 +char * +strtok(char *s, const char *delim) +{ + static char *last; + + return strtok_r(s, delim, &last); +} +#endif + +#if defined(DEBUG_STRTOK) + +/* + * Test the tokenizer. + */ +int +main() +{ + char test[80], blah[80]; + char *sep = "\\/:;=-"; + char *word, *phrase, *brkt, *brkb; + + printf("String tokenizer test:\n"); + + strcpy(test, "This;is.a:test:of=the/string\\tokenizer-function."); + + for (word = strtok(test, sep); + word; + word = strtok(NULL, sep)) + { + printf("Next word is \"%s\".\n", word); + } + + phrase = "foo"; + + strcpy(test, "This;is.a:test:of=the/string\\tokenizer-function."); + + for (word = strtok_r(test, sep, &brkt); + word; + word = strtok_r(NULL, sep, &brkt)) + { + strcpy(blah, "blah:blat:blab:blag"); + + for (phrase = strtok_r(blah, sep, &brkb); + phrase; + phrase = strtok_r(NULL, sep, &brkb)) + { + printf("So far we're at %s:%s\n", word, phrase); + } + } + + return 0; +} + +#endif /* DEBUG_STRTOK */ diff --git a/lib/other/writev.c b/lib/other/writev.c new file mode 100644 index 000000000..9bbf9a683 --- /dev/null +++ b/lib/other/writev.c @@ -0,0 +1,39 @@ +#include +#include +#include + +ssize_t writev(int fildes, const struct iovec *iov, int iovcnt) +{ +#if DEBUG + fprintf(stderr, "bind: not implemented for fd %d\n", socket); +#endif + errno= ENOSYS; + return -1; + +#if 0 + int i, r; + char *p; + ssize_t l, sum; + + /* We should buffer */ + sum= 0; + for (i= 0; i 0) + { + r= write(fildes, p, l); + if (r <= 0) + { + assert(sum == 0); + return r; + } + p += r; + l -= r; + sum += r; + } + } + return sum; +#endif +}