From fa080de7afc95aa1c19a6e6fc0e0708ced2eadc4 Mon Sep 17 00:00:00 2001 From: Joseph Hunkeler Date: Wed, 8 Jul 2015 20:46:52 -0400 Subject: Initial commit --- sys/libc/atol.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) create mode 100644 sys/libc/atol.c (limited to 'sys/libc/atol.c') diff --git a/sys/libc/atol.c b/sys/libc/atol.c new file mode 100644 index 00000000..f5780583 --- /dev/null +++ b/sys/libc/atol.c @@ -0,0 +1,49 @@ +/* Copyright(c) 1986 Association of Universities for Research in Astronomy Inc. +*/ + +#define import_spp +#define import_libc +#define import_ctype +#include + + +/* ATOL -- Ascii to long integer. Convert a simple integer in decimal radix to +** a binary long integer value. +*/ +long +atol (char *str) +{ + register char *ip = str; + register int ch; + register long lval; + 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 (INDEFL); + + /* Check for leading + or - sign. */ + neg = 0; + if (ch == '-') { + neg++; + ip++; + } else if (ch == '+') + ip++; + + /* Accumulate sequence of digits. */ + lval = 0; + while (isdigit (ch = *ip++)) + lval = lval * 10 + tointeg(ch); + + return (neg ? -lval : lval); +} -- cgit