span table

[visor] / libvisor / src / visor.c

diff --git a/libvisor/src/visor.c b/libvisor/src/visor.c
index af79b4a..fc336d8 100644 (file)
--- a/libvisor/src/visor.c
+++ b/libvisor/src/visor.c
@@ -2,8 +2,18 @@
 #include "visor.h"
 #include "vimpl.h"
 
-#define vi_malloc(s)   vi->mm.malloc(s)
-#define vi_free(p)             vi->mm.free(p)
+#define vi_malloc      vi->mm.malloc
+#define vi_free                vi->mm.free
+#define vi_realloc     vi->mm.realloc
+
+#define vi_open                vi->fop.open
+#define vi_size                vi->fop.size
+#define vi_close       vi->fop.close
+#define vi_map         vi->fop.map
+#define vi_unmap       vi->fop.unmap
+#define vi_read                vi->fop.read
+#define vi_write       vi->fop.write
+#define vi_seek                vi->fop.seek
 
 #ifdef HAVE_LIBC
 static const struct vi_alloc stdalloc = { malloc, free, realloc };
@@ -41,6 +51,11 @@ void vi_set_fileops(struct visor *vi, struct vi_fileops *fop)
        vi->fop = *fop;
 }
 
+void vi_set_ttyops(struct visor *vi, struct vi_ttyops *tty)
+{
+       vi->tty = *tty;
+}
+
 struct vi_buffer *vi_new_buf(struct visor *vi, const char *path)
 {
        struct vi_buffer *nb;
@@ -50,6 +65,7 @@ struct vi_buffer *vi_new_buf(struct visor *vi, const char *path)
                return 0;
        }
        memset(nb, 0, sizeof *nb);
+       nb->vi = vi;
 
        if(path) {
                if(vi_buf_read(nb, path) == -1) {
@@ -70,3 +86,161 @@ struct vi_buffer *vi_new_buf(struct visor *vi, const char *path)
        }
        return nb;
 }
+
+static int remove_buf(struct visor *vi, struct vi_buffer *vb)
+{
+       if(!vi->buflist) {
+               vi_error(vi, "failed to remove a buffer which doesn't exist\n");
+               return -1;
+       }
+
+       if(vb->next == vb) {
+               if(vi->buflist != vb) {
+                       vi_error(vi, "failed to remove buffer, buffer list inconsistency\n");
+                       return -1;
+               }
+               vi->buflist = 0;
+               return 0;
+       }
+
+       if(vi->buflist == vb) {
+               vi->buflist = vb->next;
+       }
+       vb->prev->next = vb->next;
+       vb->next->prev = vb->prev;
+       vb->next = vb->prev = vb;
+       return 0;
+}
+
+int vi_delete_buf(struct visor *vi, struct vi_buffer *vb)
+{
+       if(remove_buf(vi, vb) == -1) {
+               return -1;
+       }
+
+       vi_free(vb->path);
+       vi_free(vb->orig);
+       vi_free(vb->add);
+       vi_free(vb->spans);
+       return 0;
+}
+
+int vi_num_buf(struct visor *vi)
+{
+       int count;
+       struct vi_buffer *vb;
+
+       if(!vi->buflist) return 0;
+
+       count = 1;
+       vb = vi->buflist->next;
+       while(vb != vi->buflist) {
+               count++;
+               vb = vb->next;
+       }
+       return count;
+}
+
+struct vi_buffer *vi_getcur_buf(struct visor *vi)
+{
+       return vi->buflist;
+}
+
+void vi_setcur_buf(struct visor *vi, struct vi_buffer *vb)
+{
+       vi->buflist = vb;
+}
+
+struct vi_buffer *vi_next_buf(struct visor *vi)
+{
+       return vi->buflist ? vi->buflist->next : 0;
+}
+
+struct vi_buffer *vi_prev_buf(struct visor *vi)
+{
+       return vi->buflist ? vi->buflist->prev : 0;
+}
+
+static int add_span(struct vi_buffer *vb, int src, vi_addr start, unsigned long size)
+{
+       struct visor *vi = vb->vi;
+       struct vi_span *sp;
+
+       if(vb->num_spans >= vb->max_spans) {
+               int newmax = vb->max_spans > 0 ? (vb->max_spans << 1) : 16;
+               struct vi_span *tmp = vi_realloc(vb->spans, newmax * sizeof *tmp);
+               if(!tmp) return -1;
+               vb->spans = tmp;
+               vb->max_spans = newmax;
+       }
+
+       sp = vb->spans + vb->num_spans++;
+       sp->beg = start;
+       sp->size = size;
+       return 0;
+}
+
+void vi_buf_reset(struct vi_buffer *vb)
+{
+       struct visor *vi = vb->vi;
+       struct vi_buffer *prev, *next;
+
+       vi_free(vb->path);
+
+       if(vb->fp) {
+               if(vb->file_mapped) vi_unmap(vb->fp);
+               vi_close(vb->fp);
+       }
+       vi_free(vb->orig);
+       vi_free(vb->add);
+       vi_free(vb->spans);
+
+       prev = vb->prev;
+       next = vb->next;
+       memset(vb, 0, sizeof *vb);
+       vb->prev = prev;
+       vb->next = next;
+}
+
+int vi_buf_read(struct vi_buffer *vb, const char *path)
+{
+       struct visor *vi = vb->vi;
+       vi_file *fp;
+       unsigned long fsz;
+       int plen;
+
+       vi_buf_reset(vb);
+
+       if(!(fp = vi_open(path))) {
+               return -1;
+       }
+       plen = strlen(path);
+       if(!(vb->path = vi_malloc(plen + 1))) {
+               vi_error(vi, "failed to allocate path name buffer\n");
+               vi_buf_reset(vb);
+               return -1;
+       }
+       memcpy(vb->path, path, plen + 1);
+
+       vb->num_spans = 0;
+
+       if((fsz = vi_size(fp))) {
+               /* existing file, map it into memory, or failing that read it */
+               if(!vi->fop.map || !(vb->orig = vi_map(fp))) {
+                       if(!(vb->orig = vi_malloc(fsz))) {
+                               vi_buf_reset(vb);
+                               return -1;
+                       }
+               } else {
+                       vb->file_mapped = 1;
+               }
+
+               if(add_span(vb, SPAN_ORIG, 0, fsz) == -1) {
+                       vi_error(vi, "failed to allocate span\n");
+                       vi_buf_reset(vb);
+                       return -1;
+               }
+       }
+       vb->orig_size = fsz;
+       return 0;
+}