extract_first_word: Refactor allocation in empty argument case

This covers the case where an argument is an empty string, such as ''.

Instead of allocating the empty string in the individual conditions when
state == VALUE, just always allocate it at the end of state == START, at
which point we know we will have an argument.

Tested that test-util keeps passing after the refactor.

Follow up to: 14e685c29d5b317b815e3e9f056648027852b07e

diff --git a/src/basic/util.c b/src/basic/util.c
index c6b48ef3033d1b030bb4bb21a2beae2487742cee..fbd6ff5d9865c8b34c327dae124d544e5ffcf933 100644 (file)
--- a/src/basic/util.c
+++ b/src/basic/util.c
@@ -5859,25 +5859,25 @@ int extract_first_word(const char **p, char **ret, const char *separators, Extra
                                 break;
                         }
 
+                        /* We found a non-blank character, so we will always
+                         * want to return a string (even if it is empty),
+                         * allocate it here. */
+                        if (!GREEDY_REALLOC(s, allocated, sz+1))
+                                return -ENOMEM;
+
                         state = VALUE;
                         /* fallthrough */
 
                 case VALUE:
                         if (c == 0)
                                 goto finish_force_terminate;
-                        else if (c == '\'' && (flags & EXTRACT_QUOTES)) {
-                                if (!GREEDY_REALLOC(s, allocated, sz+1))
-                                        return -ENOMEM;
-
+                        else if (c == '\'' && (flags & EXTRACT_QUOTES))
                                 state = SINGLE_QUOTE;
-                        } else if (c == '\\')
+                        else if (c == '\\')
                                 state = VALUE_ESCAPE;
-                        else if (c == '\"' && (flags & EXTRACT_QUOTES)) {
-                                if (!GREEDY_REALLOC(s, allocated, sz+1))
-                                        return -ENOMEM;
-
+                        else if (c == '\"' && (flags & EXTRACT_QUOTES))
                                 state = DOUBLE_QUOTE;
-                        } else if (strchr(separators, c)) {
+                        else if (strchr(separators, c)) {
                                 if (flags & EXTRACT_DONT_COALESCE_SEPARATORS) {
                                         (*p) ++;
                                         goto finish_force_next;