github.com/afumu/libc@v0.0.6/musl/src/misc/fmtmsg.c (about)

     1  /* Public domain fmtmsg()
     2   * Written by Isaac Dunham, 2014
     3   */
     4  #include <fmtmsg.h>
     5  #include <fcntl.h>
     6  #include <unistd.h>
     7  #include <stdio.h>
     8  #include <string.h>
     9  #include <stdlib.h>
    10  #include <pthread.h>
    11  
    12  /*
    13   * If lstr is the first part of bstr, check that the next char in bstr
    14   * is either \0 or :
    15   */
    16  static int _strcolcmp(const char *lstr, const char *bstr)
    17  {
    18  	size_t i = 0;
    19  	while (lstr[i] && bstr[i] && (bstr[i] == lstr[i])) i++;
    20  	if ( lstr[i] || (bstr[i] && bstr[i] != ':')) return 1;
    21  	return 0;
    22  }
    23  
    24  int fmtmsg(long classification, const char *label, int severity,
    25             const char *text, const char *action, const char *tag)
    26  {
    27  	int ret = 0, i, consolefd, verb = 0;
    28  	char *errstring = MM_NULLSEV, *cmsg = getenv("MSGVERB");
    29  	char *const msgs[] = {
    30  		"label", "severity", "text", "action", "tag", NULL
    31  	};
    32  	int cs;
    33  
    34  	pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
    35  
    36  	if (severity == MM_HALT) errstring = "HALT: ";
    37  	else if (severity == MM_ERROR) errstring = "ERROR: ";
    38  	else if (severity == MM_WARNING) errstring = "WARNING: ";
    39  	else if (severity == MM_INFO) errstring = "INFO: ";
    40  
    41  	if (classification & MM_CONSOLE) {
    42  		consolefd = open("/dev/console", O_WRONLY);
    43  		if (consolefd < 0) {
    44  			ret = MM_NOCON;
    45  		} else {
    46  			if (dprintf(consolefd, "%s%s%s%s%s%s%s%s\n",
    47  			            label?label:"", label?": ":"",
    48  			            severity?errstring:"", text?text:"",
    49  			            action?"\nTO FIX: ":"",
    50  			            action?action:"", action?" ":"",
    51  			            tag?tag:"" )<1)
    52  				ret = MM_NOCON;
    53  			close(consolefd);
    54  		}
    55  	}
    56  
    57  	if (classification & MM_PRINT) {
    58  		while (cmsg && cmsg[0]) {
    59  			for(i=0; msgs[i]; i++) {
    60  				if (!_strcolcmp(msgs[i], cmsg)) break;
    61  			}
    62  			if (msgs[i] == NULL) {
    63  				//ignore MSGVERB-unrecognized component
    64  				verb = 0xFF;
    65  				break;
    66  			} else {
    67  				verb |= (1 << i);
    68  				cmsg = strchr(cmsg, ':');
    69  				if (cmsg) cmsg++;
    70  			}
    71  		}
    72  		if (!verb) verb = 0xFF;
    73  		if (dprintf(2, "%s%s%s%s%s%s%s%s\n",
    74  		            (verb&1 && label) ? label : "",
    75  		            (verb&1 && label) ? ": " : "",
    76  		            (verb&2 && severity) ? errstring : "",
    77  		            (verb&4 && text) ? text : "",
    78  		            (verb&8 && action) ? "\nTO FIX: " : "",
    79  		            (verb&8 && action) ? action : "",
    80  		            (verb&8 && action) ? " " : "",
    81  		            (verb&16 && tag) ? tag : "" ) < 1)
    82  			ret |= MM_NOMSG;
    83  	}
    84  	if ((ret & (MM_NOCON|MM_NOMSG)) == (MM_NOCON|MM_NOMSG))
    85  		ret = MM_NOTOK;
    86  
    87  	pthread_setcancelstate(cs, 0);
    88  
    89  	return ret;
    90  }