Added what I call virtual io to tinycc this way we can make a monolitic executable or library that contains all needed to compile programs, truly tinycc portable.

Tested under linux exec the "mk-it" shell script and you'll end up with a portable tinycc executable that doesn't depend on anything else.

tcc.c

@@ -479,6 +479,98 @@ static int parse_args(TCCState *s, int argc, char **argv)
     return optind;
 }
 
+#ifdef WITH_ATTACHMENTS
+#include "tcc_attachments.h"
+#define ATTACH_PREFIX "/_attach_"
+
+static vio_module_t vio_module;
+
+typedef struct vio_memfile_t {
+    off_t size;
+    off_t pos;
+    const unsigned char *mem;
+} vio_memfile_t;
+
+static int vio_mem_open(vio_fd *fd, const char *fn, int oflag) {
+    //printf("%d:%s\n", fd->fd, fn);
+    if(fd->vio_module && strncmp(ATTACH_PREFIX, fn, sizeof(ATTACH_PREFIX)-1) == 0){
+        int i, count = sizeof(bin2c_filesAttached)/sizeof(bin2c_filesAttached_st);
+        for(i=0; i < count; ++i) {
+            //printf("%s:%s\n", fn, bin2c_filesAttached[i].file_name);
+            if(strcmp(fn, bin2c_filesAttached[i].file_name) == 0) {
+                vio_memfile_t *mf = (vio_memfile_t*)tcc_malloc(sizeof(vio_memfile_t));
+                mf->mem = bin2c_filesAttached[i].sym_name;
+                mf->size = bin2c_filesAttached[i].size;
+                mf->pos = 0;
+                fd->fd = 1;
+                fd->vio_udata = mf;
+		//printf("%d:%s\n", fd->fd, fn);
+                return fd->fd;
+            }
+        }
+    }
+    return -1;
+}
+
+static off_t vio_mem_lseek(vio_fd fd, off_t offset, int whence) {
+    if(fd.vio_udata) {
+        off_t loffset = 0;
+        vio_memfile_t *mf = (vio_memfile_t*)fd.vio_udata;
+        if (whence == SEEK_CUR)
+            loffset = mf->pos + offset;
+        else if (whence == SEEK_SET)
+            loffset = offset;
+        else if (whence == SEEK_END)
+            loffset = ((off_t)mf->size) + offset;
+
+        if (loffset < 0 && loffset > mf->size)
+            return -1;
+
+        mf->pos = loffset;
+
+        return mf->pos;
+    }
+    return lseek(fd.fd, offset, whence);
+}
+
+static size_t vio_mem_read(vio_fd fd, void *buf, size_t bytes) {
+    if(fd.vio_udata) {
+        vio_memfile_t *mf = (vio_memfile_t*)fd.vio_udata;
+        if( (mf->pos + bytes) > mf->size) {
+            long bc = mf->size - mf->pos;
+            if(bc > 0) {
+                memcpy(buf, mf->mem + mf->pos, bc);
+                mf->pos = mf->size;
+                return bc;
+            }
+            return 0;
+        }
+        memcpy(buf, mf->mem + mf->pos, bytes);
+        mf->pos += bytes;
+        return bytes;
+    }
+    return 0;
+}
+
+static int vio_mem_close(vio_fd *fd) {
+    if(fd->vio_udata){
+        tcc_free(fd->vio_udata);
+    }
+    return 0;
+}
+
+void set_vio_module(TCCState *s){
+    vio_module.user_data = NULL;
+    vio_module.call_vio_open_flags = CALL_VIO_OPEN_FIRST;
+    vio_module.vio_open = &vio_mem_open;
+    vio_module.vio_lseek = &vio_mem_lseek;
+    vio_module.vio_read = &vio_mem_read;
+    vio_module.vio_close = &vio_mem_close;
+    tcc_set_vio_module(s, &vio_module);
+}
+
+#endif
+
 int main(int argc, char **argv)
 {
     int i;
@@ -500,6 +592,11 @@ int main(int argc, char **argv)
     m_option = NULL;
     ret = 0;
 
+#ifdef WITH_ATTACHMENTS
+    tcc_set_lib_path(s, ATTACH_PREFIX);
+    tcc_add_include_path(s, ATTACH_PREFIX);
+    set_vio_module(s);
+#endif
     optind = parse_args(s, argc - 1, argv + 1);
 
 #if defined TCC_TARGET_X86_64 || defined TCC_TARGET_I386