1 /* 2 char id_fgetc[] = "@(#)fgetc_.c 1.4"; 3 * 4 * get a character from a logical unit bypassing formatted I/O 5 * 6 * calling sequence: 7 * integer fgetc 8 * ierror = fgetc (unit, char) 9 * where: 10 * char will return a character from logical unit 11 * ierror will be 0 if successful; a system error code otherwise. 12 */ 13 14 #include "../libI77/fiodefs.h" 15 #include "../libI77/f_errno.h" 16 17 extern unit units[]; /* logical units table from iolib */ 18 19 long fgetc_(u, c, clen) 20 long *u; char *c; long clen; 21 { 22 int i; 23 unit *lu; 24 25 if (*u < 0 || *u >= MXUNIT) 26 return((long)(errno=F_ERUNIT)); 27 lu = &units[*u]; 28 if (!lu->ufd) 29 return((long)(errno=F_ERNOPEN)); 30 if (lu->uwrt && ! nowreading(lu)) 31 return((long)errno); 32 if ((i = getc (lu->ufd)) < 0) 33 { 34 if (feof(lu->ufd)) 35 return(-1L); 36 i = errno; 37 clearerr(lu->ufd); 38 return((long)i); 39 } 40 *c = i & 0177; 41 return(0L); 42 } 43