diff options
Diffstat (limited to 'mpc/src/strtoc.c')
-rw-r--r-- | mpc/src/strtoc.c | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/mpc/src/strtoc.c b/mpc/src/strtoc.c new file mode 100644 index 0000000000..b96ccee528 --- /dev/null +++ b/mpc/src/strtoc.c @@ -0,0 +1,89 @@ +/* mpc_strtoc -- Read a complex number from a string. + +Copyright (C) 2009, 2010, 2011 INRIA + +This file is part of GNU MPC. + +GNU MPC is free software; you can redistribute it and/or modify it under +the terms of the GNU Lesser General Public License as published by the +Free Software Foundation; either version 3 of the License, or (at your +option) any later version. + +GNU MPC is distributed in the hope that it will be useful, but WITHOUT ANY +WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS +FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for +more details. + +You should have received a copy of the GNU Lesser General Public License +along with this program. If not, see http://www.gnu.org/licenses/ . +*/ + +#include <string.h> +#include <ctype.h> +#include "mpc-impl.h" + +static void +skip_whitespace (const char **p) +{ + /* TODO: This function had better be inlined, but it is unclear whether + the hassle to get this implemented across all platforms is worth it. */ + while (isspace ((unsigned char) **p)) + (*p)++; +} + +int +mpc_strtoc (mpc_ptr rop, const char *nptr, char **endptr, int base, mpc_rnd_t rnd) +{ + const char *p; + char *end; + int bracketed = 0; + + int inex_re = 0, inex_im = 0; + + if (nptr == NULL || base > 36 || base == 1) + goto error; + + p = nptr; + skip_whitespace (&p); + + if (*p == '('){ + bracketed = 1; + ++p; + } + + inex_re = mpfr_strtofr (mpc_realref(rop), p, &end, base, MPC_RND_RE (rnd)); + if (end == p) + goto error; + p = end; + + if (!bracketed) + inex_im = mpfr_set_ui (mpc_imagref (rop), 0ul, GMP_RNDN); + else { + if (!isspace ((unsigned char)*p)) + goto error; + + skip_whitespace (&p); + + inex_im = mpfr_strtofr (mpc_imagref(rop), p, &end, base, MPC_RND_IM (rnd)); + if (end == p) + goto error; + p = end; + + skip_whitespace (&p); + if (*p != ')') + goto error; + + p++; + } + + if (endptr != NULL) + *endptr = (char*) p; + return MPC_INEX (inex_re, inex_im); + +error: + if (endptr != NULL) + *endptr = (char*) nptr; + mpfr_set_nan (mpc_realref (rop)); + mpfr_set_nan (mpc_imagref (rop)); + return -1; +} |