1 files changed, 120 insertions, 0 deletions
diff --git a/scan.c b/scan.c
new file mode 100644
index 0000000..da3d8ad
--- /dev/null
+++ b/scan.c
@@ -0,0 +1,120 @@
+#include "scan.h"
+
+/**
+	@file scan.c
+	@author djb
+	@source qmail, ucspi-tcp
+	@brief scanning/conversion of strings to different variable types
+*/
+
+static long int fromhex(unsigned char c) 
+{
+  if (c>='0' && c<='9')
+    return c-'0';
+  else if (c>='A' && c<='F')
+    return c-'A'+10;
+  else if (c>='a' && c<='f')
+    return c-'a'+10;
+  return -1;
+}
+
+unsigned int scan_0x(register const char *s,register unsigned int *u)
+{
+  register unsigned int pos = 0;
+  register unsigned long result = 0;
+  register long int c;
+
+  while ((c = fromhex((unsigned char) (s[pos]))) >= 0) {
+    result = (result << 4) + c;
+    ++pos;
+  }
+  *u = result;
+  return pos;
+}
+
+unsigned int scan_8long(register const char *s,register unsigned long *u)
+{
+  register unsigned int pos = 0;
+  register unsigned long result = 0;
+  register unsigned long c;
+
+  while ((c = (unsigned long) (unsigned char) (s[pos] - '0')) < 8) {
+    result = result * 8 + c;
+    ++pos; 
+  }
+  *u = result;
+  return pos;
+}
+
+unsigned int scan_uint(register const char *s,register unsigned int *u)
+{
+  register unsigned int pos; 
+  unsigned long result;
+
+  pos = scan_ulong(s,&result);
+  *u = result; 
+  return pos;
+}
+
+unsigned int scan_plusminus(register const char *s,register int *sign)
+{
+  if (*s == '+') { *sign = 1; return 1; }
+  if (*s == '-') { *sign = -1; return 1; }
+  *sign = 1; return 0;
+}
+
+unsigned int scan_long(register const char *s,register long *i)
+{
+  int sign; 
+  unsigned long u; 
+  register unsigned int len;
+
+  len = scan_plusminus(s,&sign); s += len;
+  len += scan_ulong(s,&u);
+  if (sign < 0) *i = -u; else *i = u;
+  return len;
+}
+
+
+unsigned int scan_ulong(register const char *s,register unsigned long *u)
+{
+  register unsigned int pos = 0;
+  register unsigned long result = 0;
+  register unsigned long c;
+
+  while ((c = (unsigned long) (unsigned char) (s[pos] - '0')) < 10) {
+    result = result * 10 + c;
+    ++pos; 
+  }
+  *u = result;
+  return pos;
+}
+
+unsigned int scan_xlong(const char *s,unsigned long *u)
+{
+  register const char *t = s;
+  register int l = 0;
+  register unsigned char c;
+
+  while ((c = fromhex(*t)) < 16) {
+    l = (l<<4)+c;
+    ++t;
+  }
+  *u=l;
+  return t-s;
+}
+
+unsigned int scan_xint(const char *s,unsigned int *i)
+{
+  register const char *t = s;
+  register unsigned int l = 0;
+  register unsigned char c;
+
+  while ((l >> (sizeof(l)*8 - 4)) == 0 
+      && (c = (unsigned char)fromhex((unsigned char)*t))<16) {
+    l= (l << 4) + c;
+    ++t;
+  }
+  *i = l;
+  return (unsigned int)(t-s);
+}