kandr

commit 8890c639a0b3f5e5b3ec6fe74cdaac841f9350c6
parent ac721ae15c08de48286829c6864991532dba6ac2
Author: phoebos <ben@bvnf.space>
Date:   Sat, 10 Jul 2021 20:55:05 +0100

base64: array instead of pointers

Diffstat:
M
base64.c
 | 
25
+++++++++++++------------

1 file changed, 13 insertions(+), 12 deletions(-)
diff --git a/base64.c b/base64.c
@@ -57,7 +57,7 @@ static void usage(const char *name) {
 char *base64(char *i, ssize_t length, unsigned dflg){
     if (dflg) return NULL;
     char *out = malloc(length/3 * 4 + 100);
-    char *start_p = out;
+    int o = 0; /* index of position in out */
     while (length > 0) {
         char i1, i2;
         i1 = i2 = 0;
@@ -66,22 +66,23 @@ char *base64(char *i, ssize_t length, unsigned dflg){
             i2 = i[2];
             if (length >= -1) i1 = i[1];
         }
-        *out = tbl_base64[i[0] >> 2];
-        ++out;
-        *out = tbl_base64[((i[0] & 3) << 4) + (i1 >> 2)];
-        ++out;
-        *out = tbl_base64[((i1 & 3) << 4) + (i2 >> 2)];
-        ++out;
-        *out = tbl_base64[i2 & 0x3f];
-        ++out;
+        out[o] = tbl_base64[i[0] >> 2];
+        ++o;
+        out[o] = tbl_base64[((i[0] & 3) << 4) + (i1 >> 2)];
+        ++o;
+        out[o] = tbl_base64[((i1 & 3) << 4) + (i2 >> 2)];
+        ++o;
+        out[o] = tbl_base64[i2 & 0x3f];
+        ++o;
         i += 3;
     }
-    *out = '\0';
+    out[o] = '\0';
     while (length < 0){
         length++;
-        *--out = tbl_base64[64];
+        o--;
+        out[o] = tbl_base64[64];
     }
-    return start_p;
+    return out;
 }
 
 int main(int argc, char **argv) {