yasm: fix segfaults GNU assembler

Library/Formula/yasm.rb

@@ -4,6 +4,7 @@ class Yasm < Formula
   homepage 'http://yasm.tortall.net/'
   url 'http://tortall.net/projects/yasm/releases/yasm-1.2.0.tar.gz'
   sha256 '768ffab457b90a20a6d895c39749adb547c1b7cb5c108e84b151a838a23ccf31'
+  revision 1
 
   bottle do
     cellar :any
@@ -23,6 +24,10 @@ class Yasm < Formula
   depends_on :python => :optional
   depends_on 'Cython' => :python if build.with? 'python'
 
+  # Yasm segfaults on some GNU assembler files on OS X
+  # http://tortall.lighthouseapp.com/projects/78676/tickets/269
+  patch :DATA
+
   def install
     # https://github.com/Homebrew/homebrew/pull/19593
     ENV.deparallelize
@@ -41,3 +46,46 @@ def install
     system 'make install'
   end
 end
+
+__END__
+index 96dec82..0ca18d0 100644
+--- a/modules/preprocs/gas/gas-preproc.c
++++ b/modules/preprocs/gas/gas-preproc.c
+@@ -409,12 +409,14 @@ static int gas_scan(void *preproc, struct tokenval *tokval)
+             { "^^", TOKEN_DBL_XOR },
+             { "||", TOKEN_DBL_OR }
+         };
+-        for (i = 0; i < sizeof(ops)/sizeof(ops[0]); i++) {
+-            if (!strcmp(str, ops[i].op)) {
+-                tokval->t_type = ops[i].token;
+-                break;
++       if (strlen(str) > 1) {
++            for (i = 0; i < sizeof(ops)/sizeof(ops[0]); i++) {
++                if (!strncmp(str, ops[i].op, 2)) {
++                    tokval->t_type = ops[i].token;
++                    break;
++                }
+             }
+-        }
++       }
+     }
+
+     if (tokval->t_type != TOKEN_INVALID) {
+@@ -427,7 +429,7 @@ static int gas_scan(void *preproc, struct tokenval *tokval)
+         tokval->t_type = c;
+
+         /* Is it a symbol? If so we need to make it a TOKEN_ID. */
+-        if (isalpha(c) || c == '_' || c == '.') {
++        if (isalpha(c) || c == '_' || c == '.' || c == '%') {
+             int symbol_length = 1;
+
+             c = get_char(pp);
+@@ -829,7 +831,7 @@ static int eval_macro(yasm_preproc_gas *pp, int unused, char *args)
+         skip_whitespace2(&line2);
+         if (starts_with(line2, ".macro")) {
+             nesting++;
+-        } else if (starts_with(line, ".endm") && --nesting == 0) {
++        } else if (starts_with(line2, ".endm") && --nesting == 0) {
+             return 1;
+         }
+         macro->num_lines++;