error handling for freopen()

[smdp.git] / parser.c

diff --git a/parser.c b/parser.c
index dc2677d..1ff125c 100644 (file)
--- a/parser.c
+++ b/parser.c
@@ -39,7 +39,8 @@ deck_t *markdown_load(FILE *input) {
 
     deck_t *deck = new_deck();
     slide_t *slide = new_slide();
-    line_t *line;
+    line_t *line = NULL;
+    line_t *tmp = NULL;
     cstring_t *text = cstring_init();
 
     // assign first slide to deck
@@ -52,9 +53,15 @@ deck_t *markdown_load(FILE *input) {
             // markdown analyse
             bits = markdown_analyse(text);
 
+            // if first line in file is markdown hr
+            if(!line && CHECK_BIT(bits, IS_HR)) {
+
+                // clear text
+                (text->reset)(text);
+
             // if text is markdown hr
-            if(CHECK_BIT(bits, IS_HR) &&
-               CHECK_BIT(line->bits, IS_EMPTY)) {
+            } else if(CHECK_BIT(bits, IS_HR) &&
+                      CHECK_BIT(line->bits, IS_EMPTY)) {
 
                 slide->lines = lc;
 
@@ -133,7 +140,7 @@ deck_t *markdown_load(FILE *input) {
 
             }
 
-        } else if(isprint(c) || isspace(c)) {
+        } else if(isprint(c) || isspace((unsigned char) c)) {
 
             // add char to line
             (text->expand)(text, c);
@@ -198,7 +205,7 @@ deck_t *markdown_load(FILE *input) {
                 if(line->next)
                     line->next->prev = line->prev;
 
-                // set bits on revious line
+                // set bits on previous line
                 if(CHECK_BIT(line->bits, IS_H1)) {
                     SET_BIT(line->prev->bits, IS_H1);
                 } else {
@@ -208,9 +215,13 @@ deck_t *markdown_load(FILE *input) {
                 // adjust line count
                 slide->lines -= 1;
 
+                // maintain loop condition
+                tmp = line;
+                line = line->prev;
+
                 // delete line
-                (line->text->delete)(line->text);
-                free(line);
+                (tmp->text->delete)(tmp->text);
+                free(tmp);
             }
             line = line->next;
         }
@@ -235,7 +246,7 @@ int markdown_analyse(cstring_t *text) {
     offset = next_nonblank(text, 0);
 
     // strip trailing spaces
-    for(eol = text->size; eol > offset && isspace(text->text[eol - 1]); eol--);
+    for(eol = text->size; eol > offset && isspace((unsigned char) text->text[eol - 1]); eol--);
 
     // IS_CODE
     if(offset >= CODE_INDENT) {
@@ -380,14 +391,14 @@ int length_utf8(char ch) {
 }
 
 int next_nonblank(cstring_t *text, int i) {
-    while ((i < text->size) && isspace((text->text)[i]))
+    while ((i < text->size) && isspace((unsigned char) (text->text)[i]))
         ++i;
 
     return i;
 }
 
 int next_blank(cstring_t *text, int i) {
-    while ((i < text->size) && !isspace((text->text)[i]))
+    while ((i < text->size) && !isspace((unsigned char) (text->text)[i]))
         ++i;
 
     return i;