Move some functions around to improve overall structure

[lttv.git] / lttv / lttv / sync / graph_functions.c

diff --git a/lttv/lttv/sync/graph_functions.c b/lttv/lttv/sync/graph_functions.c
index 48b66a3cd4bbb54b1945e870dbec53711dd1600d..6bd28b8091ed26354b1d7a308934543ac0556c3f 100644 (file)
--- a/lttv/lttv/sync/graph_functions.c
+++ b/lttv/lttv/sync/graph_functions.c
@@ -21,6 +21,9 @@
 #endif
 
 #include <errno.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <sys/stat.h>
 #include <sys/types.h>
 #include <unistd.h>
 
@@ -28,6 +31,100 @@
 #include "graph_functions.h"
 
 
+/*
+ * Create the directory used to hold graphs and the header of the gnuplot
+ * script.
+ *
+ * Args:
+ *   graphsDir:    name of directory
+ *
+ * Returns:
+ *   The current working directory before the execution of the function. The
+ *   string must be free'd by the caller.
+ */
+FILE* createGraphsDir(const char* const graphsDir)
+{
+       char* cwd;
+       int graphsFp;
+       FILE* result;
+       int retval;
+
+       cwd= changeToGraphsDir(graphsDir);
+
+       if ((graphsFp= open("graphs.gnu", O_WRONLY | O_CREAT | O_TRUNC, S_IRUSR |
+                               S_IWUSR | S_IXUSR | S_IRGRP | S_IWGRP | S_IXGRP | S_IROTH
+                               | S_IWOTH | S_IXOTH)) == -1)
+       {
+               g_error(strerror(errno));
+       }
+       if ((result= fdopen(graphsFp, "w")) == NULL)
+       {
+               g_error(strerror(errno));
+       }
+
+       fprintf(result,
+               "#!/usr/bin/gnuplot\n\n"
+               "set terminal postscript eps color size 8in,6in\n");
+
+       retval= chdir(cwd);
+       if (retval == -1)
+       {
+               g_error(strerror(errno));
+       }
+       free(cwd);
+
+       return result;
+}
+
+
+/*
+ * Change to the directory used to hold graphs. Create it if necessary.
+ *
+ * Args:
+ *   graphsDir:    name of directory
+ *
+ * Returns:
+ *   The current working directory before the execution of the function. The
+ *   string must be free'd by the caller.
+ */
+char* changeToGraphsDir(const char* const graphsDir)
+{
+       int retval;
+       char* cwd;
+
+       cwd= getcwd(NULL, 0);
+       if (cwd == NULL)
+       {
+               g_error(strerror(errno));
+       }
+       while ((retval= chdir(graphsDir)) != 0)
+       {
+               if (errno == ENOENT)
+               {
+                       retval= mkdir(graphsDir, S_IRUSR | S_IWUSR | S_IXUSR | S_IRGRP |
+                               S_IWGRP | S_IXGRP | S_IROTH | S_IWOTH | S_IXOTH);
+                       if (retval != 0)
+                       {
+                               g_error(strerror(errno));
+                       }
+               }
+               else
+               {
+                       g_error(strerror(errno));
+               }
+       }
+
+       return cwd;
+}
+
+
+/*
+ * Call each graph variable, option and plot line function of each module to
+ * produce a gnuplot script.
+ *
+ * Args:
+ *   syncState:    container for synchronization data
+ */
 void writeGraphsScript(SyncState* const syncState)
 {
        unsigned int i, j, k, l, m;