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Annotation of GNUtools/cctools/as/input-file.c, revision 1.1

1.1     ! root        1: /* input_file.c - Deal with Input Files -
        !             2:    Copyright (C) 1987 Free Software Foundation, Inc.
        !             3: 
        !             4: This file is part of GAS, the GNU Assembler.
        !             5: 
        !             6: GAS is free software; you can redistribute it and/or modify
        !             7: it under the terms of the GNU General Public License as published by
        !             8: the Free Software Foundation; either version 1, or (at your option)
        !             9: any later version.
        !            10: 
        !            11: GAS is distributed in the hope that it will be useful,
        !            12: but WITHOUT ANY WARRANTY; without even the implied warranty of
        !            13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
        !            14: GNU General Public License for more details.
        !            15: 
        !            16: You should have received a copy of the GNU General Public License
        !            17: along with GAS; see the file COPYING.  If not, write to
        !            18: the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
        !            19: 
        !            20: /*
        !            21:  * Confines all details of reading source bytes to this module.
        !            22:  * All O/S specific crocks should live here.
        !            23:  * What we lose in "efficiency" we gain in modularity.
        !            24:  * Note we don't need to #include the "as.h" file. No common coupling!
        !            25:  */
        !            26: 
        !            27: #define NDEBUG         /* JF remove asserts */
        !            28: 
        !            29: #include <stdio.h>
        !            30: #include <stdlib.h>
        !            31: #include <string.h>
        !            32: #include <assert.h>
        !            33: #include <libc.h>
        !            34: #include "input-file.h"
        !            35: #include "xmalloc.h"
        !            36: #include "input-scrub.h"
        !            37: #include "app.h"
        !            38: #include "as.h"
        !            39: 
        !            40: /*
        !            41:  * This variable is non-zero if the file currently being read should be
        !            42:  * preprocessed by app.  It is zero if the file can be read straight in.
        !            43:  */
        !            44: #ifndef SUSPECT
        !            45: static
        !            46: #endif
        !            47: int preprocess = 0;
        !            48: 
        !            49: /*
        !            50:  * This code opens a file, then delivers BUFFER_SIZE character
        !            51:  * chunks of the file on demand.
        !            52:  * BUFFER_SIZE is supposed to be a number chosen for speed.
        !            53:  * The caller only asks once what BUFFER_SIZE is, and asks before
        !            54:  * the nature of the input files (if any) is known.
        !            55:  */
        !            56: 
        !            57: #define BUFFER_SIZE (32 * 1024)
        !            58: 
        !            59: #ifndef NeXT
        !            60: static char in_buf[BUFFER_SIZE];
        !            61: #endif /* !defined(NeXT) */
        !            62: 
        !            63: /*
        !            64:  * We use static data: the data area is not sharable.
        !            65:  */
        !            66: 
        !            67: FILE *f_in = NULL;     /* JF do things the RIGHT way */
        !            68: /* static JF remove static so app.c can use file_name */
        !            69: char *file_name = NULL;
        !            70: 
        !            71: /* These hooks accomodate most operating systems. */
        !            72: 
        !            73: void
        !            74: input_file_begin(
        !            75: void)
        !            76: {
        !            77:   /* file_handle = -1; */
        !            78:   f_in = (FILE *)0;
        !            79: }
        !            80: 
        !            81: void
        !            82: input_file_end(
        !            83: void)
        !            84: {
        !            85: }
        !            86: 
        !            87: int                            /* Return BUFFER_SIZE. */
        !            88: input_file_buffer_size(
        !            89: void)
        !            90: {
        !            91:   return (BUFFER_SIZE);
        !            92: }
        !            93: 
        !            94: int
        !            95: input_file_is_open(
        !            96: void)
        !            97: {
        !            98:   /* return (file_handle >= 0); */
        !            99:   return f_in!=(FILE *)0;
        !           100: }
        !           101: 
        !           102: void
        !           103: input_file_open(
        !           104: char *filename,        /* "" means use stdin. Must not be 0. */
        !           105: int pre)
        !           106: {
        !           107:        int     c;
        !           108:        char    buf[80];
        !           109: 
        !           110:        preprocess = pre;
        !           111: 
        !           112:        assert( filename != 0 );        /* Filename may not be NULL. */
        !           113:        if (filename [0]) {     /* We have a file name. Suck it and see. */
        !           114:                f_in=fopen(filename,"r");
        !           115:                file_name=filename;
        !           116:        } else {                        /* use stdin for the input file. */
        !           117:                f_in = stdin;
        !           118:                file_name = "{standard input}"; /* For error messages. */
        !           119:        }
        !           120:        if (f_in==(FILE *)0) {
        !           121:                as_perror ("Can't open source file for input", file_name);
        !           122:                return;
        !           123:        }
        !           124: #ifdef NeXT    /* .include feature */
        !           125:        setbuffer(f_in, xmalloc(BUFFER_SIZE), BUFFER_SIZE);
        !           126: #else
        !           127:        setbuffer(f_in,in_buf,BUFFER_SIZE);
        !           128: #endif
        !           129:        c=getc(f_in);
        !           130:        if(c=='#') {    /* Begins with comment, may not want to preprocess */
        !           131:                c=getc(f_in);
        !           132:                if(c=='N') {
        !           133:                        fgets(buf,80,f_in);
        !           134:                        if(!strcmp(buf,"O_APP\n"))
        !           135:                                preprocess=0;
        !           136:                        if(!index(buf,'\n'))
        !           137:                                ungetc('#',f_in);       /* It was longer */
        !           138:                        else
        !           139:                                ungetc('\n',f_in);
        !           140:                } else if(c=='\n')
        !           141:                        ungetc('\n',f_in);
        !           142:                else
        !           143:                        ungetc('#',f_in);
        !           144:        } else
        !           145:                ungetc(c,f_in);
        !           146: }
        !           147: 
        !           148: char *
        !           149: input_file_give_next_buffer(
        !           150: char *where)   /* Where to place 1st character of new buffer. */
        !           151: {
        !           152:   char *       return_value;   /* -> Last char of what we read, + 1. */
        !           153:   register int size;
        !           154: 
        !           155:   if (f_in == (FILE *)0)
        !           156:       return 0;
        !           157:       /*
        !           158:        * fflush (stdin); could be done here if you want to synchronise
        !           159:        * stdin and stdout, for the case where our input file is stdin.
        !           160:        * Since the assembler shouldn't do any output to stdout, we
        !           161:        * don't bother to synch output and input.
        !           162:        */
        !           163:   /* size = read (file_handle, where, BUFFER_SIZE); */
        !           164:   if(preprocess) {
        !           165:        char *p;
        !           166:        int n;
        !           167:        int ch;
        !           168: 
        !           169:        scrub_file=f_in;
        !           170:        for(p=where,n=BUFFER_SIZE;n;--n) {
        !           171:                ch=do_scrub_next_char(scrub_from_file,scrub_to_file);
        !           172:                if(ch==EOF)
        !           173:                        break;
        !           174:                *p++=ch;
        !           175:        }
        !           176:        size=BUFFER_SIZE-n;
        !           177:   } else
        !           178:        size= fread(where,sizeof(char),BUFFER_SIZE,f_in);
        !           179:   if (size < 0)
        !           180:     {
        !           181:       as_perror ("Can't read source file: end-of-file faked.", file_name);
        !           182:       size = 0;
        !           183:     }
        !           184:   if (size)
        !           185:     return_value = where + size;
        !           186:   else
        !           187:     {
        !           188: #ifdef NeXT    /* .include feature */
        !           189:       if(doing_include)
        !           190:        free (f_in->_base);
        !           191: #endif /* NeXT .include feature */
        !           192:       if (fclose (f_in))
        !           193:        as_perror ("Can't close source file -- continuing", file_name);
        !           194:       f_in = (FILE *)0;
        !           195:       return_value = 0;
        !           196:     }
        !           197:   return (return_value);
        !           198: }
        !           199: 
        !           200: /* end: input_file.c */

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