fusl/src/misc/fmtmsg.c

/* Public domain fmtmsg()
 * Written by Isaac Dunham, 2014
 */
#include <fmtmsg.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <pthread.h>

/*
 * If lstr is the first part of bstr, check that the next char in bstr
 * is either \0 or :
 */
static int _strcolcmp(const char* lstr, const char* bstr) {
  size_t i = 0;
  while (lstr[i] && bstr[i] && (bstr[i] == lstr[i]))
    i++;
  if (lstr[i] || (bstr[i] && bstr[i] != ':'))
    return 1;
  return 0;
}

int fmtmsg(long classification,
           const char* label,
           int severity,
           const char* text,
           const char* action,
           const char* tag) {
  int ret = 0, i, consolefd, verb = 0;
  char *errstring = MM_NULLSEV, *cmsg = getenv("MSGVERB");
  char* const msgs[] = {"label", "severity", "text", "action", "tag", NULL};
  int cs;

  pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);

  if (severity == MM_HALT)
    errstring = "HALT: ";
  else if (severity == MM_ERROR)
    errstring = "ERROR: ";
  else if (severity == MM_WARNING)
    errstring = "WARNING: ";
  else if (severity == MM_INFO)
    errstring = "INFO: ";

  if (classification & MM_CONSOLE) {
    consolefd = open("/dev/console", O_WRONLY);
    if (consolefd < 0) {
      ret = MM_NOCON;
    } else {
      if (dprintf(consolefd, "%s%s%s%s%s%s%s%s\n", label ? label : "",
                  label ? ": " : "", severity ? errstring : "",
                  text ? text : "", action ? "\nTO FIX: " : "",
                  action ? action : "", action ? " " : "", tag ? tag : "") < 1)
        ret = MM_NOCON;
      close(consolefd);
    }
  }

  if (classification & MM_PRINT) {
    while (cmsg && cmsg[0]) {
      for (i = 0; msgs[i]; i++) {
        if (!_strcolcmp(msgs[i], cmsg))
          break;
      }
      if (msgs[i] == NULL) {
        // ignore MSGVERB-unrecognized component
        verb = 0xFF;
        break;
      } else {
        verb |= (1 << i);
        cmsg = strchr(cmsg, ':');
        if (cmsg)
          cmsg++;
      }
    }
    if (!verb)
      verb = 0xFF;
    if (dprintf(2, "%s%s%s%s%s%s%s%s\n", (verb & 1 && label) ? label : "",
                (verb & 1 && label) ? ": " : "",
                (verb & 2 && severity) ? errstring : "",
                (verb & 4 && text) ? text : "",
                (verb & 8 && action) ? "\nTO FIX: " : "",
                (verb & 8 && action) ? action : "",
                (verb & 8 && action) ? " " : "",
                (verb & 16 && tag) ? tag : "") < 1)
      ret |= MM_NOMSG;
  }
  if ((ret & (MM_NOCON | MM_NOMSG)) == (MM_NOCON | MM_NOMSG))
    ret = MM_NOTOK;

  pthread_setcancelstate(cs, 0);

  return ret;
}