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	errstr.c - 9base - revived minimalist port of Plan 9 userland to Unix
	git clone git://git.suckless.org/9base
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	errstr.c (1261B)
	---
	1 /*
	2 * We assume there's only one error buffer for the whole system.
	3 * If you use ffork, you need to provide a _syserrstr. Since most
	4 * people will use libthread (which provides a _syserrstr), this is
	5 * okay.
	6 */
	7
	8 #include <u.h>
	9 #include <errno.h>
	10 #include <string.h>
	11 #include <libc.h>
	12
	13 enum
	14 {
	15 EPLAN9 = 0x19283745
	16 };
	17
	18 char (_syserrstr)(void);
	19 static char xsyserr[ERRMAX];
	20 static char*
	21 getsyserr(void)
	22 {
	23 char *s;
	24
	25 s = nil;
	26 if(_syserrstr)
	27 s = (*_syserrstr)();
	28 if(s == nil)
	29 s = xsyserr;
	30 return s;
	31 }
	32
	33 int
	34 errstr(char *err, uint n)
	35 {
	36 char tmp[ERRMAX];
	37 char *syserr;
	38
	39 strecpy(tmp, tmp+ERRMAX, err);
	40 rerrstr(err, n);
	41 syserr = getsyserr();
	42 strecpy(syserr, syserr+ERRMAX, tmp);
	43 errno = EPLAN9;
	44 return 0;
	45 }
	46
	47 void
	48 rerrstr(char *err, uint n)
	49 {
	50 char *syserr;
	51
	52 syserr = getsyserr();
	53 if(errno == EINTR)
	54 strcpy(syserr, "interrupted");
	55 else if(errno != EPLAN9)
	56 strcpy(syserr, strerror(errno));
	57 strecpy(err, err+n, syserr);
	58 }
	59
	60 /* replaces __errfmt in libfmt */
	61
	62 int
	63 __errfmt(Fmt *f)
	64 {
	65 if(errno == EPLAN9)
	66 return fmtstrcpy(f, getsyserr());
	67 return fmtstrcpy(f, strerror(errno));
	68 }
	69
	70 void
	71 werrstr(char *fmt, ...)
	72 {
	73 va_list arg;
	74 char buf[ERRMAX];
	75
	76 va_start(arg, fmt);
	77 vseprint(buf, buf+ERRMAX, fmt, arg);
	78 va_end(arg);
	79 errstr(buf, ERRMAX);
	80 }
	81