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author | Garance A Drosehn <gad@FreeBSD.org> | 2020-01-12 20:25:11 +0000 |
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committer | Garance A Drosehn <gad@FreeBSD.org> | 2020-01-12 20:25:11 +0000 |
commit | 526473251ee3dd5ab71975d6b9780e00a4660b64 (patch) | |
tree | 49301aa9dde170076705e0614f089949eb370aaf /usr.bin/factor | |
parent | fe1274ee395845ade2fc2551afbae1784237daa7 (diff) | |
download | src-test2-526473251ee3dd5ab71975d6b9780e00a4660b64.tar.gz src-test2-526473251ee3dd5ab71975d6b9780e00a4660b64.zip |
Notes
Diffstat (limited to 'usr.bin/factor')
-rw-r--r-- | usr.bin/factor/factor.6 | 17 | ||||
-rw-r--r-- | usr.bin/factor/factor.c | 69 |
2 files changed, 67 insertions, 19 deletions
diff --git a/usr.bin/factor/factor.6 b/usr.bin/factor/factor.6 index 6d01a17c0fc0..65713131f59b 100644 --- a/usr.bin/factor/factor.6 +++ b/usr.bin/factor/factor.6 @@ -36,7 +36,7 @@ .\" .\" chongo <for a good prime call: 391581 * 2^216193 - 1> /\oo/\ .\" -.Dd October 10, 2002 +.Dd January 12, 2020 .Dt FACTOR 6 .Os .Sh NAME @@ -67,11 +67,22 @@ When .Nm is invoked with no arguments, .Nm -reads numbers, one per line, from standard input, until end of file or error. +reads numbers, one per line, from standard input until end of file or 0 +is entered or an error occurs. Leading white-space and empty lines are ignored. +.Pp Numbers may be preceded by a single .Ql + . +Numbers can be either decimal or hexadecimal strings where the longest +leading substring is used. Numbers are terminated by a non-digit character (such as a newline). +If the string contains only decimal digits, it is treated as a +decimal representation for a number. +A hexadecimal string can contain an optional +.Em 0x +or +.Em 0X +prefix. After a number is read, it is factored. .Pp The @@ -89,7 +100,7 @@ The value must not be greater than the maximum. The default and maximum value of .Ar stop -is 3825123056546413050. +is 18446744073709551615. .Pp When the .Nm primes diff --git a/usr.bin/factor/factor.c b/usr.bin/factor/factor.c index 8908b2530f9b..4edc2ed2a72c 100644 --- a/usr.bin/factor/factor.c +++ b/usr.bin/factor/factor.c @@ -71,6 +71,7 @@ __FBSDID("$FreeBSD$"); #include <errno.h> #include <inttypes.h> #include <limits.h> +#include <stdbool.h> #include <stdio.h> #include <stdlib.h> #include <unistd.h> @@ -97,15 +98,16 @@ typedef u_long BN_ULONG; #define BN_is_one(v) (*(v) == 1) #define BN_mod_word(a, b) (*(a) % (b)) -static int BN_dec2bn(BIGNUM **a, const char *str); -static int BN_hex2bn(BIGNUM **a, const char *str); +static int BN_dec2bn(BIGNUM **, const char *); +static int BN_hex2bn(BIGNUM **, const char *); static BN_ULONG BN_div_word(BIGNUM *, BN_ULONG); static void BN_print_fp(FILE *, const BIGNUM *); #endif static void BN_print_dec_fp(FILE *, const BIGNUM *); - +static void convert_str2bn(BIGNUM **, char *); +static bool is_hex_str(char *); static void pr_fact(BIGNUM *); /* print factors of a value */ static void pr_print(BIGNUM *); /* print a prime */ static void usage(void); @@ -148,21 +150,13 @@ main(int argc, char *argv[]) for (p = buf; isblank(*p); ++p); if (*p == '\n' || *p == '\0') continue; - if (*p == '-') - errx(1, "negative numbers aren't permitted."); - if (BN_dec2bn(&val, buf) == 0 && - BN_hex2bn(&val, buf) == 0) - errx(1, "%s: illegal numeric format.", buf); + convert_str2bn(&val, p); pr_fact(val); } /* Factor the arguments. */ else - for (; *argv != NULL; ++argv) { - if (argv[0][0] == '-') - errx(1, "negative numbers aren't permitted."); - if (BN_dec2bn(&val, argv[0]) == 0 && - BN_hex2bn(&val, argv[0]) == 0) - errx(1, "%s: illegal numeric format.", argv[0]); + for (p = *argv; p != NULL; p = *++argv) { + convert_str2bn(&val, p); pr_fact(val); } exit(0); @@ -346,7 +340,7 @@ BN_dec2bn(BIGNUM **a, const char *str) errno = 0; **a = strtoul(str, &p, 10); - return (errno == 0 && (*p == '\n' || *p == '\0')); + return (errno == 0 ? 1 : 0); /* OpenSSL returns 0 on error! */ } static int @@ -356,7 +350,7 @@ BN_hex2bn(BIGNUM **a, const char *str) errno = 0; **a = strtoul(str, &p, 16); - return (errno == 0 && (*p == '\n' || *p == '\0')); + return (errno == 0 ? 1 : 0); /* OpenSSL returns 0 on error! */ } static BN_ULONG @@ -370,3 +364,46 @@ BN_div_word(BIGNUM *a, BN_ULONG b) } #endif + +/* + * Scan the string from left-to-right to see if the longest substring + * is a valid hexadecimal number. + */ +static bool +is_hex_str(char *str) +{ + char c, *p; + bool saw_hex = false; + + for (p = str; *p; p++) { + if (isdigit(*p)) + continue; + c = tolower(*p); + if (c >= 'a' && c <= 'f') { + saw_hex = true; + continue; + } + break; /* Not a hexadecimal digit. */ + } + return saw_hex; +} + +/* Convert string pointed to by *str to a bignum. */ +static void +convert_str2bn(BIGNUM **val, char *p) +{ + int n = 0; + + if (*p == '+') p++; + if (*p == '-') + errx(1, "negative numbers aren't permitted."); + if (*p == '0') { + p++; + if (*p == 'x' || *p == 'X') + n = BN_hex2bn(val, ++p); + } else { + n = is_hex_str(p) ? BN_hex2bn(val, p) : BN_dec2bn(val, p); + } + if (n == 0) + errx(1, "%s: illegal numeric format.", p); +} |