163 lines
4.1 KiB
C
163 lines
4.1 KiB
C
/*=============================================================================
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This file is part of FLINT.
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FLINT is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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FLINT is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with FLINT; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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=============================================================================*/
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/******************************************************************************
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Copyright (C) 2011, 2012 Sebastian Pancratz
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******************************************************************************/
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#include <limits.h>
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#include "padic.h"
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int _padic_fprint(FILE * file, const fmpz_t u, slong v, const padic_ctx_t ctx)
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{
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const fmpz *p = ctx->p;
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if (fmpz_is_zero(u))
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{
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fputc('0', file);
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return 1;
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}
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if (ctx->mode == PADIC_TERSE)
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{
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if (v == 0)
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{
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fmpz_fprint(file, u);
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}
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else if (v > 0)
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{
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fmpz_t t;
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fmpz_init(t);
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fmpz_pow_ui(t, p, v);
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fmpz_mul(t, t, u);
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fmpz_fprint(file, t);
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fmpz_clear(t);
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}
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else /* v < 0 */
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{
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fmpz_t t;
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fmpz_init(t);
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fmpz_pow_ui(t, p, -v);
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_fmpq_fprint(file, u, t);
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fmpz_clear(t);
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}
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}
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else if (ctx->mode == PADIC_SERIES)
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{
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fmpz_t x;
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fmpz_t d;
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slong j;
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fmpz_init(d);
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fmpz_init(x);
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fmpz_set(x, u);
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/* Unroll first step */
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j = 0;
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{
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fmpz_mod(d, x, p); /* d = u mod p^{j+1} */
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fmpz_sub(x, x, d); /* x = x - d */
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fmpz_divexact(x, x, p); /* x = x / p */
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if (!fmpz_is_zero(d))
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{
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if (j + v != 0)
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{
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fmpz_fprint(file, d);
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fputc('*', file);
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fmpz_fprint(file, p);
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flint_fprintf(file, "^%wd", j + v);
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}
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else
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{
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fmpz_fprint(file, d);
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}
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}
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j++;
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}
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for ( ; !fmpz_is_zero(x); j++)
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{
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fmpz_mod(d, x, p); /* d = u mod p^{j+1} */
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fmpz_sub(x, x, d); /* x = x - d */
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fmpz_divexact(x, x, p); /* x = x / p */
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if (!fmpz_is_zero(d))
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{
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if (j + v != 0)
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{
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flint_fprintf(file, " + ");
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fmpz_fprint(file, d);
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fputc('*', file);
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fmpz_fprint(file, p);
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flint_fprintf(file, "^%wd", j + v);
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}
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else
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{
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flint_fprintf(file, " + ");
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fmpz_fprint(file, d);
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}
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}
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}
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fmpz_clear(x);
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fmpz_clear(d);
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}
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else if (ctx->mode == PADIC_VAL_UNIT)
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{
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if (v == 0)
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{
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fmpz_fprint(file, u);
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}
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else if (v == 1)
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{
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fmpz_fprint(file, u);
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fputc('*', file);
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fmpz_fprint(file, p);
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}
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else
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{
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fmpz_fprint(file, u);
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fputc('*', file);
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fmpz_fprint(file, p);
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flint_fprintf(file, "^%wd", v);
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}
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}
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else
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{
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flint_printf("Exception (_padic_fprint). Unknown print mode.\n");
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abort();
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}
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return 1;
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}
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int padic_fprint(FILE * file, const padic_t op, const padic_ctx_t ctx)
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{
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return _padic_fprint(file, padic_unit(op), padic_val(op), ctx);
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}
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