From ffdf32da2f20d21d5adee1231e3ac8207edab78d Mon Sep 17 00:00:00 2001
From: Bruce Hill <bruce@bruce-hill.com>
Date: Sun, 17 Jan 2021 23:06:37 -0800
Subject: Code cleanup on utils

---
 utils.c | 57 +++++++++++----------------------------------------------
 1 file changed, 11 insertions(+), 46 deletions(-)

(limited to 'utils.c')

diff --git a/utils.c b/utils.c
index 3c38e4e..76651bc 100644
--- a/utils.c
+++ b/utils.c
@@ -56,9 +56,8 @@ int matchchar(const char **str, char c)
     if (*next == c) {
         *str = &next[1];
         return 1;
-    } else {
-        return 0;
     }
+    return 0;
 }
 
 //
@@ -70,9 +69,8 @@ int matchstr(const char **str, const char *target)
     if (strncmp(next, target, strlen(target)) == 0) {
         *str = &next[strlen(target)];
         return 1;
-    } else {
-        return 0;
     }
+    return 0;
 }
 
 //
@@ -80,7 +78,7 @@ int matchstr(const char **str, const char *target)
 // character that was escaped.
 // Set *end = the first character past the end of the escape sequence.
 //
-unsigned char unescapechar(const char *escaped, const char **end)
+char unescapechar(const char *escaped, const char **end)
 {
     size_t len = 1;
     unsigned char ret = (unsigned char)*escaped;
@@ -117,7 +115,7 @@ unsigned char unescapechar(const char *escaped, const char **end)
         default: break;
     }
     *end = &escaped[len];
-    return ret;
+    return (char)ret;
 }
 
 //
@@ -127,50 +125,17 @@ unsigned char unescapechar(const char *escaped, const char **end)
 size_t unescape_string(char *dest, const char *src, size_t bufsize)
 {
     size_t len = 0;
-#define PUT(c) do { *(dest++) = (char)(c); ++len; } while (0)
-    for ( ; *src && len < bufsize; ++src) {
-        if (*src != '\\') {
-            PUT(*src);
-            continue;
-        }
-        ++src;
-        switch (*src) {
-            case 'a': PUT('\a'); break; case 'b': PUT('\b'); break;
-            case 'n': PUT('\n'); break; case 'r': PUT('\r'); break;
-            case 't': PUT('\t'); break; case 'v': PUT('\v'); break;
-            case 'e': PUT('\033'); break;
-            case 'x': { // Hex
-                static const char hextable[255] = {
-                    ['0']=0x10, ['1']=0x1, ['2']=0x2, ['3']=0x3, ['4']=0x4,
-                    ['5']=0x5, ['6']=0x6, ['7']=0x7, ['8']=0x8, ['9']=0x9,
-                    ['a']=0xa, ['b']=0xb, ['c']=0xc, ['d']=0xd, ['e']=0xe, ['f']=0xf,
-                    ['A']=0xa, ['B']=0xb, ['C']=0xc, ['D']=0xd, ['E']=0xe, ['F']=0xf,
-                };
-                if (hextable[(int)src[1]] && hextable[(int)src[2]]) {
-                    PUT((hextable[(int)src[1]] << 4) | (hextable[(int)src[2]] & 0xF));
-                    src += 2;
-                }
-                break;
-            }
-            case '0': case '1': case '2': case '3': case '4': case '5': case '6': case '7': { // Octal
-                int c = *src - '0';
-                if ('0' <= src[1] && src[1] <= '7') {
-                    ++src;
-                    c = (c << 3) | (*src - '0');
-                    if ('0' <= src[1] && src[1] <= '7' && (c << 3) < 256) {
-                        ++src;
-                        c = (c << 3) | (*src - '0');
-                    }
-                }
-                PUT(c);
-                break;
-            }
-            default: PUT(*src); break;
+    while (*src && len < bufsize) {
+        if (*src == '\\') {
+            ++src;
+            *(dest++) = unescapechar(src, &src);
+        } else {
+            *(dest++) = *(src++);
         }
+        ++len;
     }
     *dest = '\0';
     return len;
-#undef PUT
 }
 
 //
-- 
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