shell: Fix clang warnings about "string plus integer"

Building with clang results in some warnings about integer values being
added to strings:

-----------------------------------------------------------------------
eval.c:1138:13: warning: adding 'int' to a string does not append to the string [-Wstring-plus-int]
                p = " %s" + (1 - sep);
                    ~~~~~~^~~~~~~~~~~
eval.c:1138:13: note: use array indexing to silence this warning
                p = " %s" + (1 - sep);
                          ^
                    &     [          ]
1 warning generated.

...

jobs.c:1424:16: warning: adding 'int' to a string does not append to the string [-Wstring-plus-int]
                        str = "\"}" + !(quoted & 1);
                              ~~~~~~^~~~~~~~~~~~~~~
jobs.c:1424:16: note: use array indexing to silence this warning
                        str = "\"}" + !(quoted & 1);
                                    ^
                              &     [              ]
1 warning generated.
-----------------------------------------------------------------------

While the code itself is fine and the warnings are indeed harmless,
fixing them also makes the semantic more explicit: what it is actually
being increased is the address which points to the start of the string
in order to skip the initial character when some conditions are met.

Signed-off-by: Antonio Ospite <ao2@ao2.it>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

2 files changed, 4 insertions, 2 deletions

diff --git a/src/eval.c b/src/eval.c
index 514922e..1aad31a 100644
--- a/src/eval.c
+++ b/src/eval.c
@@ -1132,7 +1132,8 @@ eprintlist(struct output *out, struct strlist *sp, int sep)
 	while (sp) {
 		const char *p;
 
-		p = " %s" + (1 - sep);
+		p = " %s";
+		p += (1 - sep);
 		sep |= 1;
 		outfmt(out, p, sp->text);
 		sp = sp->next;
diff --git a/src/jobs.c b/src/jobs.c
index f3a0d80..26a6248 100644
--- a/src/jobs.c
+++ b/src/jobs.c
@@ -1421,7 +1421,8 @@ cmdputs(const char *s)
 				str = "${";
 			goto dostr;
 		case CTLENDVAR:
-			str = "\"}" + !(quoted & 1);
+			str = "\"}";
+			str += !(quoted & 1);
 			quoted >>= 1;
 			subtype = 0;
 			goto dostr;