diff options
Diffstat (limited to 'libtommath/bn_mp_fread.c')
| -rw-r--r-- | libtommath/bn_mp_fread.c | 48 |
1 files changed, 20 insertions, 28 deletions
diff --git a/libtommath/bn_mp_fread.c b/libtommath/bn_mp_fread.c index 0218e4f..52ea773 100644 --- a/libtommath/bn_mp_fread.c +++ b/libtommath/bn_mp_fread.c @@ -1,29 +1,17 @@ #include "tommath_private.h" #ifdef BN_MP_FREAD_C -/* LibTomMath, multiple-precision integer library -- Tom St Denis - * - * LibTomMath is a library that provides multiple-precision - * integer arithmetic as well as number theoretic functionality. - * - * The library was designed directly after the MPI library by - * Michael Fromberger but has been written from scratch with - * additional optimizations in place. - * - * SPDX-License-Identifier: Unlicense - */ +/* LibTomMath, multiple-precision integer library -- Tom St Denis */ +/* SPDX-License-Identifier: Unlicense */ -#ifndef LTM_NO_FILE +#ifndef MP_NO_FILE /* read a bigint from a file stream in ASCII */ -int mp_fread(mp_int *a, int radix, FILE *stream) +mp_err mp_fread(mp_int *a, int radix, FILE *stream) { - int err, ch, neg, y; - unsigned pos; - - /* clear a */ - mp_zero(a); + mp_err err; + mp_sign neg; /* if first digit is - then set negative */ - ch = fgetc(stream); + int ch = fgetc(stream); if (ch == (int)'-') { neg = MP_NEG; ch = fgetc(stream); @@ -31,8 +19,17 @@ int mp_fread(mp_int *a, int radix, FILE *stream) neg = MP_ZPOS; } - for (;;) { - pos = (unsigned)(ch - (int)'('); + /* no digits, return error */ + if (ch == EOF) { + return MP_ERR; + } + + /* clear a */ + mp_zero(a); + + do { + int y; + unsigned pos = (unsigned)(ch - (int)'('); if (mp_s_rmap_reverse_sz < pos) { break; } @@ -50,10 +47,9 @@ int mp_fread(mp_int *a, int radix, FILE *stream) if ((err = mp_add_d(a, (mp_digit)y, a)) != MP_OKAY) { return err; } + } while ((ch = fgetc(stream)) != EOF); - ch = fgetc(stream); - } - if (mp_cmp_d(a, 0uL) != MP_EQ) { + if (a->used != 0) { a->sign = neg; } @@ -62,7 +58,3 @@ int mp_fread(mp_int *a, int radix, FILE *stream) #endif #endif - -/* ref: HEAD -> master, tag: v1.1.0 */ -/* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */ -/* commit time: 2019-01-28 20:32:32 +0100 */ |