1 files changed, 97 insertions, 0 deletions
diff --git a/src/logmsg.c b/src/logmsg.c
new file mode 100644
index 0000000..97d832e
--- /dev/null
+++ b/src/logmsg.c
@@ -0,0 +1,97 @@
+#include <unistd.h>
+#include <stdarg.h>
+#include <errno.h>
+#include "buffer.h"
+#include "fmt.h"
+#include "str.h" 
+#include "stralloc.h" 
+#include "logmsg.h"
+
+/**
+  * @file logmsg.c
+  * @author kp, feh
+  * @ref qlibs
+  * @brief unified system and error message handling
+  */
+
+#define WHO "logmsg"
+
+char *build_log_msg(const char *x[])
+{
+  stralloc sa = {0};
+  stralloc_copys(&sa,"");  
+
+  while(*x) { if (!stralloc_cats(&sa,*x++)) err_sys(WHO,errno); } /* concatenate *x */
+  
+  if (!stralloc_0(&sa)) err_sys(WHO,errno);
+  return(sa.s);
+}
+
+void logmsg(const char *who,int ecode,unsigned int class,const char *msg)
+{
+  char strnum[FMT_ULONG];
+  char *codestr = "";
+  char *classstr = "";
+  char *errmsg = "";
+
+  errno = 0;   /* re-initialize errno, value is in 'code' now */
+
+/* Part 1: obtain the (error) code -- perhaps received from OS */
+
+  if (ecode != 0) {
+    codestr = "";
+    if (ecode < 0) {           // check for negative error codes 
+      ecode = (ecode^-1) + 1;
+      codestr = "-";
+    }
+    strnum[fmt_ulong(strnum,ecode)] = 0;    /* format for output */
+    char *temp = strnum;
+    codestr = str_cat(codestr,temp);
+  }
+
+/* Part 2: behavioral on error */
+
+  switch (class) {
+    case ERROR:  classstr = "error: ";    break;   // info + exit
+    case FATAL:  classstr = "fatal: ";    break;   // info + exit 
+    case DROP:   classstr = "drop: ";     break;   // info + next call/iteration
+    case ALERT:  classstr = "alert: ";    break;   // info + next statement
+    case WARN:   classstr = "warning: ";  break;   // info + next statement
+    case INFO:   classstr = "info: ";     break;   // info + continue
+    case SYNTAX: classstr = "syntax: ";   break;   // info + exit
+    case USAGE:  classstr = "usage: ";    break;   // info + exit
+    case TEMP:   classstr = "temp: ";    break;   // info + exit
+    case CAT:    classstr = "";	          break;   // info w/o \n
+    default: 
+      class = LOG; classstr =  "";        break;   // custom info + continue
+  }
+
+/* Part 3: get system error message */
+
+  if (class == FATAL || class == DROP)
+    errmsg = error_str(errno);
+
+/* Part 4: construct log message: Source: Class (Ecode) Message: Errmsg */
+
+  buffer_puts(buffer_2,who);
+  buffer_puts(buffer_2,": ");
+  buffer_puts(buffer_2,classstr);
+  if (class == FATAL || class == DROP || class == ERROR) {
+    buffer_puts(buffer_2,"(");
+    buffer_puts(buffer_2,codestr);
+    buffer_puts(buffer_2,") ");
+  }
+  buffer_puts(buffer_2,msg);
+  if (errno)  {
+    buffer_puts(buffer_2,": ");
+    buffer_puts(buffer_2,errmsg);
+  }
+  if (class != CAT) {
+    buffer_puts(buffer_2,"\n");
+    buffer_flush(buffer_2);
+  }
+
+  if (class == USAGE) _exit(USAGE); 
+  if (class == SYNTAX) _exit(SYNTAX); 
+  if (class == FATAL || class == DROP || class == ERROR) _exit(ecode);
+}