Fix #102: Permit non-standard macho section names.

Two forms are legal ({} are replaceables):
SECTION {segname} {sectname}
SECTION {sectname} segname={segname}
Also,
SECTION {sectname}
where sectname is unrecognized is also legal, defaults segname to __TEXT,
and generates a warning.

Contributed by: bird-yasm@anduin.net

svn path=/trunk/yasm/; revision=1852

2 files changed, 35 insertions, 0 deletions

diff --git a/libyasm/valparam.c b/libyasm/valparam.c
index 84cf984d..752ab7e3 100644
--- a/libyasm/valparam.c
+++ b/libyasm/valparam.c
@@ -354,6 +354,25 @@ yasm_dir_helper_intn(void *obj, yasm_valparam *vp, unsigned long line,
 }
 
 int
+yasm_dir_helper_string(void *obj, yasm_valparam *vp, unsigned long line,
+                       void *data, uintptr_t arg)
+{
+    /*@dependent@*/ /*@null@*/ const char *local;
+    char **s = (char **)data;
+
+    if (*s)
+        yasm_xfree(*s);
+    if (!(local = yasm_vp_string(vp))) {
+        yasm_error_set(YASM_ERROR_VALUE,
+                       N_("argument to `%s' is not a string or identifier"),
+                       vp->val);
+        return -1;
+    }
+    *s = yasm__xstrdup(local);
+    return 0;
+}
+
+int
 yasm_dir_helper_valparam_warn(void *obj, yasm_valparam *vp,
                               unsigned long line, void *data)
 {
diff --git a/libyasm/valparam.h b/libyasm/valparam.h
index 9a2a1303..4a64a66f 100644
--- a/libyasm/valparam.h
+++ b/libyasm/valparam.h
@@ -340,6 +340,22 @@ int yasm_dir_helper_flag_and(void *obj, yasm_valparam *vp, unsigned long line,
 int yasm_dir_helper_intn(void *obj, yasm_valparam *vp, unsigned long line,
                          void *data, uintptr_t arg);
 
+/** Standard helper for yasm_dir_helper() that parses an string (or
+ * standalone identifier) parameter.
+ * The #yasm_dir_help structure that uses this function should have
+ * needsparam=1.  The data parameter that is ultimately passed to this
+ * function (e.g. yasm_dir_helper() data parameter plus #yasm_dir_help.off)
+ * must point to a char * initialized to NULL.
+ * \param obj   unused
+ * \param vp    valparam
+ * \param line  unused
+ * \param data  pointer to char *
+ * \param arg   unused
+ * \return -1 on error, 0 otherwise.
+ */
+int yasm_dir_helper_string(void *obj, yasm_valparam *vp, unsigned long line,
+                           void *data, uintptr_t arg);
+
 /** Standard catch-all callback fro yasm_dir_helper().  Generates standard
  * warning for all valparams.
  * \param obj   unused