Initial commit

1 files changed, 48 insertions, 0 deletions

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 <iraf.h>
+
+
+/* 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);
+}