From 40e5a5811c6ffce9b0974e93cdd927cbcf60c157 Mon Sep 17 00:00:00 2001 From: Joe Hunkeler Date: Tue, 11 Aug 2015 16:51:37 -0400 Subject: Repatch (from linux) of OSX IRAF --- sys/libc/atoi.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 48 insertions(+) create mode 100644 sys/libc/atoi.c (limited to 'sys/libc/atoi.c') diff --git a/sys/libc/atoi.c b/sys/libc/atoi.c new file mode 100644 index 00000000..6df13153 --- /dev/null +++ b/sys/libc/atoi.c @@ -0,0 +1,48 @@ +/* Copyright(c) 1986 Association of Universities for Research in Astronomy Inc. +*/ + +#define import_spp +#define import_libc +#define import_ctype +#include + + +/* ATOI -- Ascii to integer. Convert a simple integer in decimal radix to +** a binary integer value. +*/ +int +atoi (char *str) +{ + register char *ip = str; + register int ch, ival; + int neg; + + + if (*str == EOS) + return (0); + + /* Skip leading whitespace. */ + while (isspace (*ip)) + ip++; + + /* Check for indefinite. */ + if ((ch = *ip) == 'I') + if (strncmp (ip, "INDEF", 5) == 0) + if (! (isalnum (ch = *(ip+5)) || ch == '_')) + return (INDEFI); + + /* Check for leading + or - sign. */ + neg = 0; + if (ch == '-') { + neg++; + ip++; + } else if (ch == '+') + ip++; + + /* Accumulate sequence of digits. */ + ival = 0; + while (isdigit (ch = *ip++)) + ival = ival * 10 + tointeg(ch); + + return (neg ? -ival : ival); +} -- cgit