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| /* |
| * Copyright (c) 1990, 2007 The Regents of the University of California. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms are permitted |
| * provided that the above copyright notice and this paragraph are |
| * duplicated in all such forms and that any documentation, |
| * advertising materials, and other materials related to such |
| * distribution and use acknowledge that the software was developed |
| * by the University of California, Berkeley. The name of the |
| * University may not be used to endorse or promote products derived |
| * from this software without specific prior written permission. |
| * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR |
| * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED |
| * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
| */ |
| |
| /* |
| FUNCTION |
| <<fread>>---read array elements from a file |
| |
| INDEX |
| fread |
| INDEX |
| _fread_r |
| |
| ANSI_SYNOPSIS |
| #include <stdio.h> |
| size_t fread(void *<[buf]>, size_t <[size]>, size_t <[count]>, |
| FILE *<[fp]>); |
| |
| #include <stdio.h> |
| size_t _fread_r(struct _reent *<[ptr]>, void *<[buf]>, |
| size_t <[size]>, size_t <[count]>, FILE *<[fp]>); |
| |
| TRAD_SYNOPSIS |
| #include <stdio.h> |
| size_t fread(<[buf]>, <[size]>, <[count]>, <[fp]>) |
| char *<[buf]>; |
| size_t <[size]>; |
| size_t <[count]>; |
| FILE *<[fp]>; |
| |
| #include <stdio.h> |
| size_t _fread_r(<[ptr]>, <[buf]>, <[size]>, <[count]>, <[fp]>) |
| struct _reent *<[ptr]>; |
| char *<[buf]>; |
| size_t <[size]>; |
| size_t <[count]>; |
| FILE *<[fp]>; |
| |
| DESCRIPTION |
| <<fread>> attempts to copy, from the file or stream identified by |
| <[fp]>, <[count]> elements (each of size <[size]>) into memory, |
| starting at <[buf]>. <<fread>> may copy fewer elements than |
| <[count]> if an error, or end of file, intervenes. |
| |
| <<fread>> also advances the file position indicator (if any) for |
| <[fp]> by the number of @emph{characters} actually read. |
| |
| <<_fread_r>> is simply the reentrant version of <<fread>> that |
| takes an additional reentrant structure pointer argument: <[ptr]>. |
| |
| RETURNS |
| The result of <<fread>> is the number of elements it succeeded in |
| reading. |
| |
| PORTABILITY |
| ANSI C requires <<fread>>. |
| |
| Supporting OS subroutines required: <<close>>, <<fstat>>, <<isatty>>, |
| <<lseek>>, <<read>>, <<sbrk>>, <<write>>. |
| */ |
| |
| #include <_ansi.h> |
| #include <stdio.h> |
| #include <string.h> |
| #include <malloc.h> |
| #include "local.h" |
| |
| #ifdef __SCLE |
| static size_t |
| _DEFUN(crlf_r, (ptr, fp, buf, count, eof), |
| struct _reent * ptr _AND |
| FILE * fp _AND |
| char * buf _AND |
| size_t count _AND |
| int eof) |
| { |
| int r; |
| char *s, *d, *e; |
| |
| if (count == 0) |
| return 0; |
| |
| e = buf + count; |
| for (s=d=buf; s<e-1; s++) |
| { |
| if (*s == '\r' && s[1] == '\n') |
| s++; |
| *d++ = *s; |
| } |
| if (s < e) |
| { |
| if (*s == '\r') |
| { |
| int c = __sgetc_raw_r (ptr, fp); |
| if (c == '\n') |
| *s = '\n'; |
| else |
| ungetc (c, fp); |
| } |
| *d++ = *s++; |
| } |
| |
| |
| while (d < e) |
| { |
| r = _getc_r (ptr, fp); |
| if (r == EOF) |
| return count - (e-d); |
| *d++ = r; |
| } |
| |
| return count; |
| |
| } |
| |
| #endif |
| |
| size_t |
| _DEFUN(_fread_r, (ptr, buf, size, count, fp), |
| struct _reent * ptr _AND |
| _PTR buf _AND |
| size_t size _AND |
| size_t count _AND |
| FILE * fp) |
| { |
| register size_t resid; |
| register char *p; |
| register int r; |
| size_t total; |
| |
| if ((resid = count * size) == 0) |
| return 0; |
| |
| CHECK_INIT(ptr, fp); |
| |
| _flockfile (fp); |
| ORIENT (fp, -1); |
| if (fp->_r < 0) |
| fp->_r = 0; |
| total = resid; |
| p = buf; |
| |
| #if !defined(PREFER_SIZE_OVER_SPEED) && !defined(__OPTIMIZE_SIZE__) |
| |
| /* Optimize unbuffered I/O. */ |
| if (fp->_flags & __SNBF) |
| { |
| /* First copy any available characters from ungetc buffer. */ |
| int copy_size = resid > fp->_r ? fp->_r : resid; |
| _CAST_VOID memcpy ((_PTR) p, (_PTR) fp->_p, (size_t) copy_size); |
| fp->_p += copy_size; |
| fp->_r -= copy_size; |
| p += copy_size; |
| resid -= copy_size; |
| |
| /* If still more data needed, free any allocated ungetc buffer. */ |
| if (HASUB (fp) && resid > 0) |
| FREEUB (ptr, fp); |
| |
| /* Finally read directly into user's buffer if needed. */ |
| while (resid > 0) |
| { |
| int rc = 0; |
| /* save fp buffering state */ |
| void *old_base = fp->_bf._base; |
| void * old_p = fp->_p; |
| int old_size = fp->_bf._size; |
| /* allow __refill to use user's buffer */ |
| fp->_bf._base = (unsigned char *) p; |
| fp->_bf._size = resid; |
| fp->_p = (unsigned char *) p; |
| rc = __srefill_r (ptr, fp); |
| /* restore fp buffering back to original state */ |
| fp->_bf._base = old_base; |
| fp->_bf._size = old_size; |
| fp->_p = old_p; |
| resid -= fp->_r; |
| p += fp->_r; |
| fp->_r = 0; |
| if (rc) |
| { |
| #ifdef __SCLE |
| if (fp->_flags & __SCLE) |
| { |
| _funlockfile (fp); |
| return crlf_r (ptr, fp, buf, total-resid, 1) / size; |
| } |
| #endif |
| _funlockfile (fp); |
| return (total - resid) / size; |
| } |
| } |
| } |
| else |
| #endif /* !PREFER_SIZE_OVER_SPEED && !__OPTIMIZE_SIZE__ */ |
| { |
| while (resid > (r = fp->_r)) |
| { |
| _CAST_VOID memcpy ((_PTR) p, (_PTR) fp->_p, (size_t) r); |
| fp->_p += r; |
| /* fp->_r = 0 ... done in __srefill */ |
| p += r; |
| resid -= r; |
| if (__srefill_r (ptr, fp)) |
| { |
| /* no more input: return partial result */ |
| #ifdef __SCLE |
| if (fp->_flags & __SCLE) |
| { |
| _funlockfile (fp); |
| return crlf_r (ptr, fp, buf, total-resid, 1) / size; |
| } |
| #endif |
| _funlockfile (fp); |
| return (total - resid) / size; |
| } |
| } |
| _CAST_VOID memcpy ((_PTR) p, (_PTR) fp->_p, resid); |
| fp->_r -= resid; |
| fp->_p += resid; |
| } |
| |
| /* Perform any CR/LF clean-up if necessary. */ |
| #ifdef __SCLE |
| if (fp->_flags & __SCLE) |
| { |
| _funlockfile (fp); |
| return crlf_r(ptr, fp, buf, total, 0) / size; |
| } |
| #endif |
| _funlockfile (fp); |
| return count; |
| } |
| |
| #ifndef _REENT_ONLY |
| size_t |
| _DEFUN(fread, (buf, size, count, fp), |
| _PTR buf _AND |
| size_t size _AND |
| size_t count _AND |
| FILE * fp) |
| { |
| return _fread_r (_REENT, buf, size, count, fp); |
| } |
| #endif |