Simple output gathering design

[sysstatus.git] / src / common / common.c

diff --git a/src/common/common.c b/src/common/common.c
new file mode 100644 (file)
index 0000000..9e62259
--- /dev/null
+++ b/src/common/common.c
@@ -0,0 +1,74 @@
+#include <assert.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/types.h>
+
+#include "common.h"
+
+
+static int linebuf_sane(GlobalData *g)
+{
+  return (g->linelen < g->linemax);
+}
+
+
+void line_clear(GlobalData *g)
+{
+  assert(g->linemax > 0);
+
+  g->line[0] = '\0';
+  g->linelen = 0;
+}
+
+
+void line_append_strn(GlobalData *g, char *string, size_t len)
+{
+  assert(linebuf_sane(g));
+
+  if (g->linemax <= g->linelen + len) {
+    /* Buffer full. Tough luck. */
+    return;
+  }
+
+  memcpy(&g->line[g->linelen], string, len);
+  g->linelen += len;
+  g->line[g->linelen] = '\0';
+}
+
+
+void line_append_str(GlobalData *g, char *string)
+{
+  line_append_strn(g, string, strlen(string));
+}
+
+
+
+void line_append_item(GlobalData *g, StatusItem *s)
+{
+  line_append_str(g, " ");
+
+  if (s->color) {
+    line_append_str(g, "^fg(");
+    line_append_str(g, s->color);
+    line_append_str(g, ")");
+  }
+
+  if (s->text) {
+    line_append_str(g, s->text);
+  }
+
+  line_append_str(g, " ");
+}
+
+
+void line_print(GlobalData *g)
+{
+  puts(g->line);
+}
+
+
+void statusitem_init(StatusItem *s)
+{
+  s->color = NULL;
+  s->text = NULL;
+}