Logo: don't segfault if --logo-source starts with non-alpha charactors

CarterLi · CarterLi · commit 0b5631471a99 · 2023-08-13T09:23:37.000+08:00
Ref: #518
diff --git a/src/logo/logo.c b/src/logo/logo.c
@@ -211,7 +211,7 @@ static bool logoHasName(const FFlogo* logo, const FFstrbuf* name, bool small)
 
 static const FFlogo* logoGetBuiltin(const FFstrbuf* name, FFLogoSize size)
 {
-    if (name->length == 0)
+    if (name->length == 0 || !isalpha(name->chars[0]))
         return NULL;
 
     for(const FFlogo* logo = ffLogoBuiltins[toupper(name->chars[0]) - 'A']; *logo->names; ++logo)

Original file line number	Diff line number	Diff line change
`@@ -211,7 +211,7 @@ static bool logoHasName(const FFlogo* logo, const FFstrbuf* name, bool small)`
`211`	`211`
`212`	`212`	`static const FFlogo* logoGetBuiltin(const FFstrbuf* name, FFLogoSize size)`
`213`	`213`	`{`
`214`		`- if (name->length == 0)`
	`214`	`+ if (name->length == 0 \|\| !isalpha(name->chars[0]))`
`215`	`215`	`return NULL;`
`216`	`216`
`217`	`217`	`for(const FFlogo* logo = ffLogoBuiltins[toupper(name->chars[0]) - 'A']; *logo->names; ++logo)`