Commit | Line | Data |
---|---|---|
30723849 | 1 | /* |
337a7375 | 2 | char id_getc[] = "@(#)getc_.c 1.3"; |
30723849 DW |
3 | * |
4 | * get a character from the standard input | |
5 | * | |
6 | * calling sequence: | |
7 | * integer getc | |
8 | * ierror = getc (char) | |
9 | * where: | |
10 | * char will be read from the standard input, usually the terminal | |
11 | * ierror will be 0 if successful; a system error code otherwise. | |
12 | */ | |
13 | ||
14 | #include "../libI77/f_errno.h" | |
15 | #include "../libI77/fiodefs.h" | |
16 | ||
17 | extern unit units[]; /* logical units table from iolib */ | |
18 | ||
19 | long getc_(c, clen) | |
20 | char *c; long clen; | |
21 | { | |
338a6799 DW |
22 | int i; |
23 | unit *lu; | |
30723849 | 24 | |
338a6799 DW |
25 | lu = &units[STDIN]; |
26 | if (!lu->ufd) | |
30723849 | 27 | return((long)(errno=F_ERNOPEN)); |
337a7375 DW |
28 | if (lu->uwrt && ! nowreading(lu)) |
29 | return((long)errno); | |
338a6799 | 30 | if ((i = getc (lu->ufd)) < 0) |
30723849 | 31 | { |
338a6799 | 32 | if (feof(lu->ufd)) |
30723849 DW |
33 | return(-1L); |
34 | i = errno; | |
338a6799 | 35 | clearerr(lu->ufd); |
30723849 DW |
36 | return((long)i); |
37 | } | |
38 | *c = i & 0177; | |
39 | return(0L); | |
40 | } |