From 64bc6412188b141c010ac3b8e813b837dd991e80 Mon Sep 17 00:00:00 2001 From: Erik Andersen Date: Sun, 14 May 2000 04:16:35 +0000 Subject: Initial revision --- libc/stdio/stdio.c | 925 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 925 insertions(+) create mode 100644 libc/stdio/stdio.c (limited to 'libc/stdio/stdio.c') diff --git a/libc/stdio/stdio.c b/libc/stdio/stdio.c new file mode 100644 index 000000000..98d0ba3b4 --- /dev/null +++ b/libc/stdio/stdio.c @@ -0,0 +1,925 @@ +/* Copyright (C) 1996 Robert de Bath + * This file is part of the Linux-8086 C library and is distributed + * under the GNU Library General Public License. + */ + +/* This is an implementation of the C standard IO package. + */ + +#include + +#include +#include +#include +#include + +#undef STUB_FWRITE + +extern FILE *__IO_list; /* For fflush at exit */ + +#define FIXED_BUFFERS 2 +struct fixed_buffer { + unsigned char data[BUFSIZ]; + int used; +}; + +extern struct fixed_buffer _fixed_buffers[2]; + +#define Inline_init __io_init_vars() + +#ifdef L__stdio_init + +#define buferr (stderr->unbuf) /* Stderr is unbuffered */ + +FILE *__IO_list = 0; /* For fflush at exit */ + +#if 0 +static char bufin[BUFSIZ]; +static char bufout[BUFSIZ]; +#ifndef buferr +static char buferr[BUFSIZ]; +#endif + +#else +static char *bufin; +static char *bufout; +#ifndef buferr +static char *buferr; +#endif +#endif + +FILE stdin[1] = +{ +#if 0 + {bufin, bufin, bufin, bufin, bufin + sizeof(bufin), +#else + {0, 0, 0, 0, 0, +#endif + 0, _IOFBF | __MODE_READ | __MODE_IOTRAN} +}; + +FILE stdout[1] = +{ +#if 0 + {bufout, bufout, bufout, bufout, bufout + sizeof(bufout), +#else + {0, 0, 0, 0, 0, +#endif + 1, _IOFBF | __MODE_WRITE | __MODE_IOTRAN} +}; + +FILE stderr[1] = +{ +#if 0 + {buferr, buferr, buferr, buferr, buferr + sizeof(buferr), +#else + {0, 0, 0, 0, 0, +#endif + 2, _IONBF | __MODE_WRITE | __MODE_IOTRAN} +}; + +/* Call the stdio initiliser; it's main job it to call atexit */ + +#define STATIC + +STATIC int +__stdio_close_all() +{ + FILE *fp; + fflush(stdout); + fflush(stderr); + for (fp = __IO_list; fp; fp = fp->next) + { + fflush(fp); + close(fp->fd); + /* Note we're not de-allocating the memory */ + /* There doesn't seem to be much point :-) */ + fp->fd = -1; + } +} + +static int first_time = 0; + +struct fixed_buffer _fixed_buffers[2]; + + +STATIC void +__io_init_vars() +{ + if( first_time ) return; + first_time = 1; + + stdin->bufpos = bufin = _fixed_buffers[0].data; /*(char *)malloc(BUFSIZ)*/; + stdin->bufread = bufin; + stdin->bufwrite = bufin; + stdin->bufstart = bufin; + stdin->bufend = bufin + sizeof(bufin); + stdin->fd = 0; + stdin->mode = _IOFBF | __MODE_READ | __MODE_IOTRAN | __MODE_FREEBUF; + + _fixed_buffers[0].used = 1; + + stdout->bufpos = bufout = _fixed_buffers[1].data; /*(char *)malloc(BUFSIZ);*/ + stdout->bufread = bufout; + stdout->bufwrite = bufout; + stdout->bufstart = bufout; + stdout->bufend = bufout + sizeof(bufout); + stdout->fd = 1; + stdout->mode = _IOFBF | __MODE_WRITE | __MODE_IOTRAN | __MODE_FREEBUF; + + _fixed_buffers[1].used = 1; + +#if 0 + stderr->bufpos = buferr = (char *)malloc(BUFSIZ); +#else + stderr->bufpos = buferr; +#endif + stderr->bufread = buferr; + stderr->bufwrite = buferr; + stderr->bufstart = buferr; + stderr->bufend = buferr + sizeof(buferr); + stderr->fd = 2; + stderr->mode = _IONBF | __MODE_WRITE | __MODE_IOTRAN; + + if (isatty(1)) + stdout->mode |= _IOLBF; + atexit(__stdio_close_all); +} +#endif + +#ifdef L_fputc +int +fputc(ch, fp) +int ch; +FILE *fp; +{ + register int v; + Inline_init; + + v = fp->mode; + /* If last op was a read ... */ + if ((v & __MODE_READING) && fflush(fp)) + return EOF; + + /* Can't write or there's been an EOF or error then return EOF */ + if ((v & (__MODE_WRITE | __MODE_EOF | __MODE_ERR)) != __MODE_WRITE) + return EOF; + + /* In MSDOS translation mode */ +#if __MODE_IOTRAN + if (ch == '\n' && (v & __MODE_IOTRAN) && fputc('\r', fp) == EOF) + return EOF; +#endif + + /* Buffer is full */ + if (fp->bufpos >= fp->bufend && fflush(fp)) + return EOF; + + /* Right! Do it! */ + *(fp->bufpos++) = ch; + fp->mode |= __MODE_WRITING; + + /* Unbuffered or Line buffered and end of line */ + if (((ch == '\n' && (v & _IOLBF)) || (v & _IONBF)) + && fflush(fp)) + return EOF; + + /* Can the macro handle this by itself ? */ + if (v & (__MODE_IOTRAN | _IOLBF | _IONBF)) + fp->bufwrite = fp->bufstart; /* Nope */ + else + fp->bufwrite = fp->bufend; /* Yup */ + + /* Correct return val */ + return (unsigned char) ch; +} +#endif + +#ifdef L_fgetc +int +fgetc(fp) +FILE *fp; +{ + int ch; + Inline_init; + + if (fp->mode & __MODE_WRITING) + fflush(fp); + + try_again: + /* Can't read or there's been an EOF or error then return EOF */ + if ((fp->mode & (__MODE_READ | __MODE_EOF | __MODE_ERR)) != __MODE_READ) + return EOF; + + /* Nothing in the buffer - fill it up */ + if (fp->bufpos >= fp->bufread) + { + fp->bufpos = fp->bufread = fp->bufstart; + ch = fread(fp->bufpos, 1, fp->bufend - fp->bufstart, fp); + if (ch == 0) + return EOF; + fp->bufread += ch; + fp->mode |= __MODE_READING; + fp->mode &= ~__MODE_UNGOT; + } + ch = *(fp->bufpos++); + +#if __MODE_IOTRAN + /* In MSDOS translation mode; WARN: Doesn't work with UNIX macro */ + if (ch == '\r' && (fp->mode & __MODE_IOTRAN)) + goto try_again; +#endif + + return ch; +} +#endif + +#ifdef L_fflush +int +fflush(fp) +FILE *fp; +{ + int len, cc, rv=0; + char * bstart; + if (fp == NULL) /* On NULL flush the lot. */ + { + if (fflush(stdin)) + return EOF; + if (fflush(stdout)) + return EOF; + if (fflush(stderr)) + return EOF; + + for (fp = __IO_list; fp; fp = fp->next) + if (fflush(fp)) + return EOF; + + return 0; + } + + /* If there's output data pending */ + if (fp->mode & __MODE_WRITING) + { + len = fp->bufpos - fp->bufstart; + + if (len) + { + bstart = fp->bufstart; + /* + * The loop is so we don't get upset by signals or partial writes. + */ + do + { + cc = write(fp->fd, bstart, len); + if( cc > 0 ) + { + bstart+=cc; len-=cc; + } + } + while ( cc>0 || (cc == -1 && errno == EINTR)); + /* + * If we get here with len!=0 there was an error, exactly what to + * do about it is another matter ... + * + * I'll just clear the buffer. + */ + if (len) + { + fp->mode |= __MODE_ERR; + rv = EOF; + } + } + } + /* If there's data in the buffer sychronise the file positions */ + else if (fp->mode & __MODE_READING) + { + /* Humm, I think this means sync the file like fpurge() ... */ + /* Anyway the user isn't supposed to call this function when reading */ + + len = fp->bufread - fp->bufpos; /* Bytes buffered but unread */ + /* If it's a file, make it good */ + if (len > 0 && lseek(fp->fd, (long)-len, 1) < 0) + { + /* Hummm - Not certain here, I don't think this is reported */ + /* + * fp->mode |= __MODE_ERR; return EOF; + */ + } + } + + /* All done, no problem */ + fp->mode &= (~(__MODE_READING|__MODE_WRITING|__MODE_EOF|__MODE_UNGOT)); + fp->bufread = fp->bufwrite = fp->bufpos = fp->bufstart; + return rv; +} +#endif + +#ifdef L_fgets +/* Nothing special here ... */ +char * +fgets(s, count, f) +char *s; +size_t count; +FILE *f; +{ + char *ret; + register size_t i; + register int ch; + + ret = s; + for (i = count; i > 0; i--) + { + ch = getc(f); + if (ch == EOF) + { + if (s == ret) + return 0; + break; + } + *s++ = (char) ch; + if (ch == '\n') + break; + } + *s = 0; + + if (ferror(f)) + return 0; + return ret; +} +#endif + +#ifdef L_gets +char * +gets(str) /* BAD function; DON'T use it! */ +char *str; +{ + /* Auwlright it will work but of course _your_ program will crash */ + /* if it's given a too long line */ + register char *p = str; + register int c; + + while (((c = getc(stdin)) != EOF) && (c != '\n')) + *p++ = c; + *p = '\0'; + return (((c == EOF) && (p == str)) ? NULL : str); /* NULL == EOF */ +} +#endif + +#ifdef L_fputs +int +fputs(str, fp) +char *str; +FILE *fp; +{ + register int n = 0; + while (*str) + { + if (putc(*str++, fp) == EOF) + return (EOF); + ++n; + } + return (n); +} +#endif + +#ifdef L_puts +int +puts(str) +char *str; +{ + register int n; + + if (((n = fputs(str, stdout)) == EOF) + || (putc('\n', stdout) == EOF)) + return (EOF); + return (++n); +} +#endif + +#ifdef L_fread +/* + * fread will often be used to read in large chunks of data calling read() + * directly can be a big win in this case. Beware also fgetc calls this + * function to fill the buffer. + * + * This ignores __MODE__IOTRAN; probably exactly what you want. (It _is_ what + * fgetc wants) + */ +int +fread(buf, size, nelm, fp) +char *buf; +int size; +int nelm; +FILE *fp; +{ + int len, v; + unsigned bytes, got = 0; + Inline_init; + + v = fp->mode; + + /* Want to do this to bring the file pointer up to date */ + if (v & __MODE_WRITING) + fflush(fp); + + /* Can't read or there's been an EOF or error then return zero */ + if ((v & (__MODE_READ | __MODE_EOF | __MODE_ERR)) != __MODE_READ) + return 0; + + /* This could be long, doesn't seem much point tho */ + bytes = size * nelm; + + len = fp->bufread - fp->bufpos; + if (len >= bytes) /* Enough buffered */ + { + memcpy(buf, fp->bufpos, (unsigned) bytes); + fp->bufpos += bytes; + return bytes; + } + else if (len > 0) /* Some buffered */ + { + memcpy(buf, fp->bufpos, len); + got = len; + } + + /* Need more; do it with a direct read */ + len = read(fp->fd, buf + got, (unsigned) (bytes - got)); + + /* Possibly for now _or_ later */ + if (len < 0) + { + fp->mode |= __MODE_ERR; + len = 0; + } + else if (len == 0) + fp->mode |= __MODE_EOF; + + return (got + len) / size; +} +#endif + +#ifdef L_fwrite +/* + * Like fread, fwrite will often be used to write out large chunks of + * data; calling write() directly can be a big win in this case. + * + * But first we check to see if there's space in the buffer. + * + * Again this ignores __MODE__IOTRAN. + */ +int +fwrite(buf, size, nelm, fp) +char *buf; +int size; +int nelm; +FILE *fp; +{ + register int v; + int len; + unsigned bytes, put; + +#ifdef STUB_FWRITE + bytes = size * nelm; + while(bytes>0) { + len=write(fp->fd, buf, bytes); + if (len<=0) { + break; + } + bytes -= len; + buf += len; + } + return nelm; +#else + + v = fp->mode; + /* If last op was a read ... */ + if ((v & __MODE_READING) && fflush(fp)) + return 0; + + /* Can't write or there's been an EOF or error then return 0 */ + if ((v & (__MODE_WRITE | __MODE_EOF | __MODE_ERR)) != __MODE_WRITE) + return 0; + + /* This could be long, doesn't seem much point tho */ + bytes = size * nelm; + + len = fp->bufend - fp->bufpos; + + /* Flush the buffer if not enough room */ + if (bytes > len) + if (fflush(fp)) + return 0; + + len = fp->bufend - fp->bufpos; + if (bytes <= len) /* It'll fit in the buffer ? */ + { + fp->mode |= __MODE_WRITING; + memcpy(fp->bufpos, buf, bytes); + fp->bufpos += bytes; + + /* If we're not fully buffered */ + if (v & (_IOLBF | _IONBF)) + fflush(fp); + + return nelm; + } + else + /* Too big for the buffer */ + { + put = bytes; + do + { + len = write(fp->fd, buf, bytes); + if( len > 0 ) + { + buf+=len; bytes-=len; + } + } + while (len > 0 || (len == -1 && errno == EINTR)); + + if (len < 0) + fp->mode |= __MODE_ERR; + + put -= bytes; + } + + return put / size; +#endif +} +#endif + +#ifdef L_rewind +void +rewind(fp) +FILE * fp; +{ + fseek(fp, (long)0, 0); + clearerr(fp); +} +#endif + +#ifdef L_fseek +int +fseek(fp, offset, ref) +FILE *fp; +long offset; +int ref; +{ +#if 0 + /* FIXME: this is broken! BROKEN!!!! */ + /* if __MODE_READING and no ungetc ever done can just move pointer */ + /* This needs testing! */ + + if ( (fp->mode &(__MODE_READING | __MODE_UNGOT)) == __MODE_READING && + ( ref == SEEK_SET || ref == SEEK_CUR )) + { + long fpos = lseek(fp->fd, 0L, SEEK_CUR); + if( fpos == -1 ) return EOF; + + if( ref == SEEK_CUR ) + { + ref = SEEK_SET; + offset = fpos + offset + fp->bufpos - fp->bufread; + } + if( ref == SEEK_SET ) + { + if ( offset < fpos && offset >= fpos + fp->bufstart - fp->bufread ) + { + fp->bufpos = offset - fpos + fp->bufread; + return 0; + } + } + } +#endif + + /* Use fflush to sync the pointers */ + + if (fflush(fp) == EOF) + return EOF; + if (lseek(fp->fd, offset, ref) < 0) + return EOF; + return 0; +} +#endif + +#ifdef L_ftell +long ftell(fp) +FILE * fp; +{ + long rv; + if (fflush(fp) == EOF) + return EOF; + return lseek(fp->fd, 0L, SEEK_CUR); +} +#endif + +#ifdef L_fopen +/* + * This Fopen is all three of fopen, fdopen and freopen. The macros in + * stdio.h show the other names. + */ +FILE * +__fopen(fname, fd, fp, mode) +char *fname; +int fd; +FILE *fp; +char *mode; +{ + int open_mode = 0; +#if __MODE_IOTRAN + int do_iosense = 1; +#endif + int fopen_mode = 0; + FILE *nfp = 0; + + /* If we've got an fp close the old one (freopen) */ + if (fp) + { + /* Careful, don't de-allocate it */ + fopen_mode |= (fp->mode & (__MODE_BUF | __MODE_FREEFIL | __MODE_FREEBUF)); + fp->mode &= ~(__MODE_FREEFIL | __MODE_FREEBUF); + fclose(fp); + } + + /* decode the new open mode */ + while (*mode) + switch (*mode++) + { + case 'r': + fopen_mode |= __MODE_READ; + break; + case 'w': + fopen_mode |= __MODE_WRITE; + open_mode = (O_CREAT | O_TRUNC); + break; + case 'a': + fopen_mode |= __MODE_WRITE; + open_mode = (O_CREAT | O_APPEND); + break; + case '+': + fopen_mode |= __MODE_RDWR; + break; +#if __MODE_IOTRAN + case 'b': /* Binary */ + fopen_mode &= ~__MODE_IOTRAN; + do_iosense=0; + break; + case 't': /* Text */ + fopen_mode |= __MODE_IOTRAN; + do_iosense=0; + break; +#endif + } + + /* Add in the read/write options to mode for open() */ + switch (fopen_mode & (__MODE_READ | __MODE_WRITE)) + { + case 0: + return 0; + case __MODE_READ: + open_mode |= O_RDONLY; + break; + case __MODE_WRITE: + open_mode |= O_WRONLY; + break; + default: + open_mode |= O_RDWR; + break; + } + + /* Allocate the (FILE) before we do anything irreversable */ + if (fp == 0) + { + nfp = malloc(sizeof(FILE)); + if (nfp == 0) + return 0; + } + + /* Open the file itself */ + if (fname) + fd = open(fname, open_mode, 0666); + if (fd < 0) /* Grrrr */ + { + if (nfp) + free(nfp); + return 0; + } + + /* If this isn't freopen create a (FILE) and buffer for it */ + if (fp == 0) + { + int i; + fp = nfp; + fp->next = __IO_list; + __IO_list = fp; + + fp->mode = __MODE_FREEFIL; + if( isatty(fd) ) + { + fp->mode |= _IOLBF; +#if __MODE_IOTRAN + if( do_iosense ) fopen_mode |= __MODE_IOTRAN; +#endif + } + else + fp->mode |= _IOFBF; + + for(i=0;ibufstart = _fixed_buffers[i].data; + _fixed_buffers[i].used = 1; + break; + } + + if (i == FIXED_BUFFERS) + fp->bufstart = malloc(BUFSIZ); + + if (fp->bufstart == 0) /* Oops, no mem */ + { /* Humm, full buffering with a two(!) byte + * buffer. */ + fp->bufstart = fp->unbuf; + fp->bufend = fp->unbuf + sizeof(fp->unbuf); + } + else + { + fp->bufend = fp->bufstart + BUFSIZ; + fp->mode |= __MODE_FREEBUF; + } + } + /* Ok, file's ready clear the buffer and save important bits */ + fp->bufpos = fp->bufread = fp->bufwrite = fp->bufstart; + fp->mode |= fopen_mode; + fp->fd = fd; + return fp; +} +#endif + +#ifdef L_fclose +int +fclose(fp) +FILE *fp; +{ + int rv = 0; + + if (fp == 0) + { + errno = EINVAL; + return EOF; + } + if (fflush(fp)) + return EOF; + + if (close(fp->fd)) + rv = EOF; + fp->fd = -1; + + if (fp->mode & __MODE_FREEBUF) + { + int i; + for(i=0;ibufstart == _fixed_buffers[i].data) { + _fixed_buffers[i].used = 0; + break; + } + if(i==FIXED_BUFFERS) + free(fp->bufstart); + fp->mode &= ~__MODE_FREEBUF; + fp->bufstart = fp->bufend = 0; + } + + if (fp->mode & __MODE_FREEFIL) + { + FILE *prev = 0, *ptr; + fp->mode = 0; + + for (ptr = __IO_list; ptr && ptr != fp; ptr = ptr->next) + ; + if (ptr == fp) + { + if (prev == 0) + __IO_list = fp->next; + else + prev->next = fp->next; + } + free(fp); + } + else + fp->mode = 0; + + return rv; +} +#endif + +#ifdef L_setbuffer +void +setbuffer(fp, buf, size) +FILE * fp; +char * buf; +int size; +{ + fflush(fp); + + if ((fp->bufstart == (unsigned char*)buf) && (fp->bufend == ((unsigned char*)buf + size))) + return; + + if( fp->mode & __MODE_FREEBUF ) { + int i; + for(i=0;ibufstart == _fixed_buffers[i].data) { + _fixed_buffers[i].used = 0; + break; + } + if(i==FIXED_BUFFERS) + free(fp->bufstart); + } + fp->mode &= ~(__MODE_FREEBUF|__MODE_BUF); + + if( buf == 0 ) + { + fp->bufstart = fp->unbuf; + fp->bufend = fp->unbuf + sizeof(fp->unbuf); + fp->mode |= _IONBF; + } + else + { + fp->bufstart = buf; + fp->bufend = buf+size; + fp->mode |= _IOFBF; + } + fp->bufpos = fp->bufread = fp->bufwrite = fp->bufstart; +} +#endif + +#ifdef L_setvbuf +int setvbuf(fp, buf, mode, size) +FILE * fp; +char * buf; +int mode; +size_t size; +{ + fflush(fp); + if( fp->mode & __MODE_FREEBUF ) { + int i; + for(i=0;ibufstart == _fixed_buffers[i].data) { + _fixed_buffers[i].used = 0; + break; + } + if(i==FIXED_BUFFERS) + free(fp->bufstart); + } + fp->mode &= ~(__MODE_FREEBUF|__MODE_BUF); + fp->bufstart = fp->unbuf; + fp->bufend = fp->unbuf + sizeof(fp->unbuf); + fp->mode |= _IONBF; + + if( mode == _IOFBF || mode == _IOLBF ) + { + if( size <= 0 ) size = BUFSIZ; + if( buf == 0 ) + if (size == BUFSIZ) { + int i; + for(i=0;ibufstart = buf; + fp->bufend = buf+size; + fp->mode |= mode; + } + fp->bufpos = fp->bufread = fp->bufwrite = fp->bufstart; +} +#endif + +#ifdef L_ungetc +int +ungetc(c, fp) +int c; +FILE *fp; +{ + if (fp->mode & __MODE_WRITING) + fflush(fp); + + /* Can't read or there's been an error then return EOF */ + if ((fp->mode & (__MODE_READ | __MODE_ERR)) != __MODE_READ) + return EOF; + + /* Can't do fast fseeks */ + fp->mode |= __MODE_UNGOT; + + if( fp->bufpos > fp->bufstart ) + return *--fp->bufpos = (unsigned char) c; + else if( fp->bufread == fp->bufstart ) + return *fp->bufread++ = (unsigned char) c; + else + return EOF; +} +#endif -- cgit v1.2.3