From 52e55e8db7b0428ee78fab1475f9d92b257a29f6 Mon Sep 17 00:00:00 2001
From: "Eric S. Raymond" <esr@thyrsus.com>
Date: Fri, 30 Jan 2009 09:56:13 +0000
Subject: Make hex_escapes() generally available.

---
 hex.c | 70 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 70 insertions(+)

(limited to 'hex.c')

diff --git a/hex.c b/hex.c
index 270e346a..2c7170a0 100644
--- a/hex.c
+++ b/hex.c
@@ -98,3 +98,73 @@ int hex2bin(char *s)
     return ((a<<4) + b);
 }
 /*@ -charint +shiftimplementation @*/
+
+ssize_t hex_escapes(/*@out@*/char *cooked, const char *raw)
+/* interpret C-style hex escapes */
+{
+    char c, *cookend;
+
+    /*@ +charint -mustdefine -compdef @*/
+    for (cookend = cooked; *raw != '\0'; raw++)
+	if (*raw != '\\')
+	    *cookend++ = *raw;
+	else {
+	    switch(*++raw) {
+	    case 'b': *cookend++ = '\b'; break;
+	    case 'e': *cookend++ = '\x1b'; break;
+	    case 'f': *cookend++ = '\f'; break;
+	    case 'n': *cookend++ = '\n'; break;
+	    case 'r': *cookend++ = '\r'; break;
+	    case 't': *cookend++ = '\r'; break;
+	    case 'v': *cookend++ = '\v'; break;
+	    case 'x':
+		switch(*++raw) {
+		case '0': c = 0x00; break;
+		case '1': c = 0x10; break;
+		case '2': c = 0x20; break;
+		case '3': c = 0x30; break;
+		case '4': c = 0x40; break;
+		case '5': c = 0x50; break;
+		case '6': c = 0x60; break;
+		case '7': c = 0x70; break;
+		case '8': c = 0x80; break;
+		case '9': c = 0x90; break;
+		case 'A': case 'a': c = 0xa0; break;
+		case 'B': case 'b': c = 0xb0; break;
+		case 'C': case 'c': c = 0xc0; break;
+		case 'D': case 'd': c = 0xd0; break;
+		case 'E': case 'e': c = 0xe0; break;
+		case 'F': case 'f': c = 0xf0; break;
+		default:
+		    return -1;
+		}
+		switch(*++raw) {
+		case '0': c += 0x00; break;
+		case '1': c += 0x01; break;
+		case '2': c += 0x02; break;
+		case '3': c += 0x03; break;
+		case '4': c += 0x04; break;
+		case '5': c += 0x05; break;
+		case '6': c += 0x06; break;
+		case '7': c += 0x07; break;
+		case '8': c += 0x08; break;
+		case '9': c += 0x09; break;
+		case 'A': case 'a': c += 0x0a; break;
+		case 'B': case 'b': c += 0x0b; break;
+		case 'C': case 'c': c += 0x0c; break;
+		case 'D': case 'd': c += 0x0d; break;
+		case 'E': case 'e': c += 0x0e; break;
+		case 'F': case 'f': c += 0x0f; break;
+		default:
+		    return -2;
+		}
+		*cookend++ = c;
+		break;
+	    case '\\': *cookend++ = '\\'; break;
+	    default:
+		return -3;
+	    }
+	}
+    return (ssize_t)(cookend - cooked);
+    /*@ +charint +mustdefine +compdef @*/
+}
-- 
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