| | 1 | /* |
| | 2 | * Copyright (c) 1980 Regents of the University of California. |
| | 3 | * All rights reserved. The Berkeley software License Agreement |
| | 4 | * specifies the terms and conditions for redistribution. |
| | 5 | */ |
| | 6 | |
| | 7 | #ifndef lint |
| | 8 | static char sccsid[] = "@(#)wbuf.c 5.1 (Berkeley) %G%"; |
| | 9 | #endif not lint |
| | 10 | |
| | 11 | #include <stdio.h> |
| | 12 | #include <sys/types.h> |
| | 13 | #include <sys/stat.h> |
| | 14 | |
| | 15 | char *malloc(); |
| | 16 | |
| | 17 | _flsbuf(c, iop) |
| | 18 | unsigned char c; |
| | 19 | register FILE *iop; |
| | 20 | { |
| | 21 | register char *base; |
| | 22 | register n, rn; |
| | 23 | char c1; |
| | 24 | int size; |
| | 25 | struct stat stbuf; |
| | 26 | |
| | 27 | if (iop->_flag & _IORW) { |
| | 28 | iop->_flag |= _IOWRT; |
| | 29 | iop->_flag &= ~(_IOEOF|_IOREAD); |
| | 30 | } |
| | 31 | |
| | 32 | if ((iop->_flag&_IOWRT)==0) |
| | 33 | return(EOF); |
| | 34 | tryagain: |
| | 35 | if (iop->_flag&_IOLBF) { |
| | 36 | base = iop->_base; |
| | 37 | *iop->_ptr++ = c; |
| | 38 | if (iop->_ptr >= base+iop->_bufsiz || c == '\n') { |
| | 39 | n = write(fileno(iop), base, rn = iop->_ptr - base); |
| | 40 | iop->_ptr = base; |
| | 41 | iop->_cnt = 0; |
| | 42 | } else |
| | 43 | rn = n = 0; |
| | 44 | } else if (iop->_flag&_IONBF) { |
| | 45 | c1 = c; |
| | 46 | rn = 1; |
| | 47 | n = write(fileno(iop), &c1, rn); |
| | 48 | iop->_cnt = 0; |
| | 49 | } else { |
| | 50 | if ((base=iop->_base)==NULL) { |
| | 51 | if (fstat(fileno(iop), &stbuf) < 0 || |
| | 52 | stbuf.st_blksize <= NULL) |
| | 53 | size = BUFSIZ; |
| | 54 | else |
| | 55 | size = stbuf.st_blksize; |
| | 56 | if ((iop->_base=base=malloc(size)) == NULL) { |
| | 57 | iop->_flag |= _IONBF; |
| | 58 | goto tryagain; |
| | 59 | } |
| | 60 | iop->_flag |= _IOMYBUF; |
| | 61 | iop->_bufsiz = size; |
| | 62 | if (iop==stdout && isatty(fileno(stdout))) { |
| | 63 | iop->_flag |= _IOLBF; |
| | 64 | iop->_ptr = base; |
| | 65 | goto tryagain; |
| | 66 | } |
| | 67 | rn = n = 0; |
| | 68 | } else if ((rn = n = iop->_ptr - base) > 0) { |
| | 69 | iop->_ptr = base; |
| | 70 | n = write(fileno(iop), base, n); |
| | 71 | } |
| | 72 | iop->_cnt = iop->_bufsiz-1; |
| | 73 | *base++ = c; |
| | 74 | iop->_ptr = base; |
| | 75 | } |
| | 76 | if (rn != n) { |
| | 77 | iop->_flag |= _IOERR; |
| | 78 | return(EOF); |
| | 79 | } |
| | 80 | return(c); |
| | 81 | } |
| | 82 | |
| | 83 | fflush(iop) |
| | 84 | register FILE *iop; |
| | 85 | { |
| | 86 | register char *base; |
| | 87 | register n; |
| | 88 | |
| | 89 | if ((iop->_flag&(_IONBF|_IOWRT))==_IOWRT |
| | 90 | && (base=iop->_base)!=NULL && (n=iop->_ptr-base)>0) { |
| | 91 | iop->_ptr = base; |
| | 92 | iop->_cnt = (iop->_flag&(_IOLBF|_IONBF)) ? 0 : iop->_bufsiz; |
| | 93 | if (write(fileno(iop), base, n)!=n) { |
| | 94 | iop->_flag |= _IOERR; |
| | 95 | return(EOF); |
| | 96 | } |
| | 97 | } |
| | 98 | return(0); |
| | 99 | } |
| | 100 | |
| | 101 | fclose(iop) |
| | 102 | register FILE *iop; |
| | 103 | { |
| | 104 | register int r; |
| | 105 | |
| | 106 | r = EOF; |
| | 107 | if (iop->_flag&(_IOREAD|_IOWRT|_IORW) && (iop->_flag&_IOSTRG)==0) { |
| | 108 | r = fflush(iop); |
| | 109 | if (close(fileno(iop)) < 0) |
| | 110 | r = EOF; |
| | 111 | if (iop->_flag&_IOMYBUF) |
| | 112 | free(iop->_base); |
| | 113 | } |
| | 114 | iop->_cnt = 0; |
| | 115 | iop->_base = (char *)NULL; |
| | 116 | iop->_ptr = (char *)NULL; |
| | 117 | iop->_bufsiz = 0; |
| | 118 | iop->_flag = 0; |
| | 119 | iop->_file = 0; |
| | 120 | return(r); |
| | 121 | } |
projects / unix-history / blame_incremental