Support pcilib_log_once calls

1 files changed, 35 insertions, 2 deletions

diff --git a/pcilib/error.c b/pcilib/error.c
index ad38622..2c4296e 100644
--- a/pcilib/error.c
+++ b/pcilib/error.c
@@ -1,10 +1,15 @@
+#define _BSD_SOURCE
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <stdarg.h>
+#include <string.h>
 
 #include "export.h"
 #include "error.h"
 
+#define PCILIB_LOGGER_HISTORY 16
+
 void pcilib_print_error(void *arg, const char *file, int line, pcilib_log_priority_t prio, const char *msg, va_list va) {
     vprintf(msg, va);
     printf(" [%s:%d]\n", file, line);
@@ -13,21 +18,49 @@ void pcilib_print_error(void *arg, const char *file, int line, pcilib_log_priori
 static void *pcilib_logger_argument = NULL;
 static pcilib_log_priority_t pcilib_logger_min_prio = PCILIB_LOG_WARNING;
 static pcilib_logger_t pcilib_logger = pcilib_print_error;
+static char *pcilib_logger_history[PCILIB_LOGGER_HISTORY] = {0};
+static int pcilib_logger_history_pointer = 0;
+
+static int pcilib_log_check_history(pcilib_log_flags_t flags, const char *msg) {
+    int i;
+
+    if ((flags&PCILIB_LOG_ONCE) == 0)
+	return 0;
+
+    for (i = 0; ((i < PCILIB_LOGGER_HISTORY)&&(pcilib_logger_history[i])); i++) {
+	if (!strcmp(msg, pcilib_logger_history[i]))
+	    return -1;
+    }
 
+    if (pcilib_logger_history[pcilib_logger_history_pointer])
+	free(pcilib_logger_history[pcilib_logger_history_pointer]);
 
+    pcilib_logger_history[pcilib_logger_history_pointer] = strdup(msg);
 
-void pcilib_log_message(const char *file, int line, pcilib_log_priority_t prio, const char *msg, ...) {
+    if (++pcilib_logger_history_pointer == PCILIB_LOGGER_HISTORY)
+	pcilib_logger_history_pointer = 0;
+
+    return 0;
+}
+
+void pcilib_log_message(const char *file, int line, pcilib_log_flags_t flags, pcilib_log_priority_t prio, const char *msg, ...) {
     va_list va;
 
     if ((!prio)||(prio >= pcilib_logger_min_prio)) {
+	if (pcilib_log_check_history(flags, msg))
+	    return;
+
 	va_start(va, msg);
 	pcilib_logger(pcilib_logger_argument, file, line, prio, msg, va);
 	va_end(va);
     }
 }
 
-void pcilib_log_vmessage(const char *file, int line, pcilib_log_priority_t prio, const char *msg, va_list va) {
+void pcilib_log_vmessage(const char *file, int line, pcilib_log_flags_t flags, pcilib_log_priority_t prio, const char *msg, va_list va) {
     if ((!prio)||(prio >= pcilib_logger_min_prio)) {
+	if (pcilib_log_check_history(flags, msg))
+	    return;
+
 	pcilib_logger(pcilib_logger_argument, file, line, prio, msg, va);
     }
 }