POTD skeleton #83.

Signed-off-by: Toni Uhlig <matzeton@googlemail.com>

1 files changed, 171 insertions, 0 deletions

diff --git a/src/log_file.c b/src/log_file.c
new file mode 100644
index 0000000..f0a78f2
--- /dev/null
+++ b/src/log_file.c
@@ -0,0 +1,171 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <stdarg.h>
+#include <fcntl.h>
+#include <assert.h>
+
+#include "log_file.h"
+
+char *log_file = NULL;
+static FILE *flog = NULL;
+
+
+int log_open_file(void)
+{
+    if (!log_file) {
+        fprintf(stderr, "%s\n", "The path to the logfile was not set.");
+        return 1;
+    }
+
+    flog = fopen(log_file, "a+");
+    if (!flog) {
+        fprintf(stderr, "Could not open '%s' for writing: %s\n",
+            log_file, strerror(errno));
+        return 1;
+    }
+
+    if (setvbuf(flog, NULL, _IOLBF, BUFSIZ)) {
+        log_close_file();
+        return 1;
+    }
+
+    return 0;
+}
+
+void log_close_file(void)
+{
+    fclose(flog);
+    flog = NULL;
+}
+
+void log_fmt_file(log_priority prio, const char *fmt, ...)
+{
+    pid_t my_pid;
+    char out[LOGMSG_MAXLEN+1] = {0};
+    va_list arglist;
+
+    if (prio < log_prio)
+        return;
+    assert(fmt);
+    va_start(arglist, fmt);
+    assert( vsnprintf(&out[0], LOGMSG_MAXLEN, fmt, arglist) >= 0 );
+    va_end(arglist);
+
+    my_pid = getpid();
+    switch (prio) {
+        case DEBUG:
+            fprintf(flog, "[DEBUG]  [%d] %s\n", my_pid, out);
+            break;
+        case NOTICE:
+            fprintf(flog, "[NOTICE] [%d] %s\n", my_pid, out);
+            break;
+        case WARNING:
+            fprintf(flog, "[WARNING][%d] %s\n", my_pid, out);
+            break;
+        case ERROR:
+            fprintf(flog, "[ERROR]  [%d] %s\n", my_pid, out);
+            break;
+        case CMD:
+            fprintf(flog, "[CMD]    [%d] %s\n", my_pid, out);
+            break;
+    }
+}
+
+void log_fmtex_file(log_priority prio, const char *srcfile,
+                    size_t line, const char *fmt, ...)
+{
+    pid_t my_pid;
+    char out[LOGMSG_MAXLEN+1] = {0};
+    va_list arglist;
+
+    if (prio < log_prio)
+        return;
+    assert(fmt);
+    va_start(arglist, fmt);
+    assert( vsnprintf(&out[0], LOGMSG_MAXLEN, fmt, arglist) >= 0 );
+    va_end(arglist);
+
+    my_pid = getpid();
+    switch (prio) {
+        case DEBUG:
+            fprintf(flog, "[DEBUG]  [%d] %s.%lu: %s\n", my_pid, srcfile,
+                line, out);
+            break;
+        case NOTICE:
+            fprintf(flog, "[NOTICE] [%d] %s.%lu: %s\n",
+                my_pid, srcfile, line, out);
+            break;
+        case WARNING:
+            fprintf(flog, "[WARNING][%d] %s.%lu: %s\n",
+                my_pid, srcfile, line, out);
+            break;
+        case ERROR:
+            fprintf(flog, "[ERROR]  [%d] %s.%lu: %s\n",
+                my_pid, srcfile, line, out);
+            break;
+        case CMD:
+            break;
+    }
+}
+
+void log_fmtexerr_file(log_priority prio, const char *srcfile,
+                       size_t line, const char *fmt, ...)
+{
+    pid_t my_pid;
+    int saved_errno = errno;
+    char out[LOGMSG_MAXLEN+1] = {0};
+    va_list arglist;
+
+    if (prio < log_prio)
+        return;
+    assert(fmt);
+    va_start(arglist, fmt);
+    assert( vsnprintf(&out[0], LOGMSG_MAXLEN, fmt, arglist) >= 0 );
+    va_end(arglist);
+
+    my_pid = getpid();
+    switch (prio) {
+        case DEBUG:
+            if (saved_errno)
+                fprintf(flog, "[DEBUG]  [%d] %s.%lu: %s failed: %s\n",
+                    my_pid, srcfile, line, out,
+                    strerror(saved_errno));
+            else
+                fprintf(flog, "[DEBUG]  [%d] %s.%lu: %s failed\n",
+                    my_pid, srcfile, line, out);
+            break;
+        case NOTICE:
+            if (saved_errno)
+                fprintf(flog, "[NOTICE] [%d] %s.%lu: %s failed: %s\n",
+                    my_pid, srcfile,
+                    line, out, strerror(saved_errno));
+            else
+                fprintf(flog, "[NOTICE] [%d] %s.%lu: %s failed\n",
+                    my_pid, srcfile,
+                    line, out);
+            break;
+        case WARNING:
+            if (saved_errno)
+                fprintf(flog, "[WARNING][%d] %s.%lu: %s failed: %s\n",
+                    my_pid, srcfile,
+                    line, out, strerror(saved_errno));
+            else
+                fprintf(flog, "[WARNING][%d] %s.%lu: %s failed\n",
+                    my_pid, srcfile,
+                    line, out);
+            break;
+        case ERROR:
+            if (saved_errno)
+                fprintf(flog, "[ERROR]  [%d] %s.%lu: %s failed: %s\n",
+                    my_pid, srcfile,
+                    line, out, strerror(saved_errno));
+            else
+                fprintf(flog, "[ERROR]  [%d] %s.%lu: %s failed\n",
+                    my_pid, srcfile,
+                    line, out);
+            break;
+        case CMD:
+            break;
+    }
+}