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Annotation of coherent/b/lib/libc/stdio/finit.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * libc/stdio/finit.c
                      3:  * Standard i/o library internals.
                      4:  * Initialize file for i/o:
                      5:  *     decide if buffered
                      6:  *     allocate buffer if required
                      7:  *     stuff appropriate get/put functions
                      8:  *     reset char count
                      9:  */
                     10: 
                     11: #include <stdio.h>
                     12: #include <errno.h>
                     13: 
                     14: extern long    lseek();
                     15: 
                     16: extern int     _fgetc();
                     17: extern int     _fputc();
                     18: extern int     _fgetb();
                     19: extern int     _fputb();
                     20: extern int     _fputt();
                     21: 
                     22: void
                     23: finit(fp) register FILE *fp;
                     24: {
                     25:        register int tty, sav;
                     26: 
                     27:        sav = errno;                    /* because isatty() can set errno */
                     28:        if (fp->_bp == NULL
                     29:         && (fp->_ff&_FSTBUF || (tty=isatty(fileno(fp))) && fp!=stdout
                     30:            || (fp->_bp = malloc(BUFSIZ)) == NULL)) {
                     31:                fp->_gt = &_fgetc;
                     32:                fp->_pt = &_fputc;
                     33:        } else if ((fp->_ff&_FSTBUF)==0 && tty && fp==stdout) {
                     34:                fp->_gt = &_fgetb;
                     35:                fp->_pt = &_fputt;
                     36:                fp->_dp = fp->_cp = fp->_bp;
                     37:                fp->_cc = 0;
                     38:        } else {
                     39:                fp->_gt = &_fgetb;
                     40:                fp->_pt = &_fputb;
                     41:                fp->_dp = fp->_cp = fp->_bp + boffset(fileno(fp));
                     42:                fp->_cc = 0;
                     43:        }
                     44:        errno = sav;
                     45: }
                     46: 
                     47: static
                     48: int
                     49: boffset(fd) int fd;
                     50: {
                     51:        register long off;
                     52: 
                     53:        if ((off=lseek(fd, 0L, SEEK_CUR))==-1L)
                     54:                return 0;
                     55:        else
                     56:                return (unsigned)off%BUFSIZ;
                     57: }
                     58: 
                     59: int
                     60: _fginit(fp) register FILE *fp;
                     61: {
                     62:        finit(fp);
                     63:        return (*fp->_gt)(fp);
                     64: }
                     65: 
                     66: int
                     67: _fpinit(c, fp) register char c; register FILE *fp;
                     68: {
                     69:        finit(fp);
                     70:        return (*fp->_pt)(c, fp);
                     71: }
                     72: 
                     73: 
                     74: /*
                     75:  * Close all files.
                     76:  * Called from exit().
                     77:  */
                     78: void
                     79: _finish()
                     80: {
                     81:        register FILE **fpp;
                     82: 
                     83:        for (fpp = &_fp[_NFILE-1]; fpp>=&_fp[0]; --fpp)
                     84:                if (*fpp != NULL)
                     85:                        fclose(*fpp);
                     86: }
                     87: 
                     88: /* end of libc/stdio/finit.c */

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