myio.c-Dateireferenz

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include "myio.h"

Include-Abhängigkeitsdiagramm für myio.c:

gehe zum Quellcode dieser Datei

Datenstrukturen
struct	StopListRecord

Makrodefinitionen
#define	MAX_SYM   2048

Funktionen
int	b_file_preload (char *filename)
int	b_read (void *buf, int count)
int	b_seek (long offset)
int	b_seek_read (long offset, char *buf, int len)
char *	b_get_buf ()
int	load_import (char *importfile)
int	find_import_symbol (char *sym)
char *	get_import_symbol (unsigned symidx)
int	load_stoplist (char *stopfile)
int	stoplist_check (char *sym)
void	raise_error ()

Variablen
static char *	filebuf =0
static int	filesize =0
static int	filecuridx =0
static char *	import_buf =0
static char *	import_syms [MAX_SYM]
static unsigned int	import_hash [MAX_SYM]
static int	import_counts =0
static int	importfilesize =0
char *	stoplist_buf =0
struct StopListRecord *	stoplisthead =0

Makro-Dokumentation

#define MAX_SYM   2048

Definiert in Zeile 82 der Datei myio.c.

Dokumentation der Funktionen

int b_file_preload

(

char *

filename)

Definiert in Zeile 20 der Datei myio.c.

{
    int fd;

    filesize=0;
    filecuridx=0;
    
    fd=open(filename, O_RDONLY|O_BINARY);
    if ( fd <=0 ) return 0;
    filesize = lseek(fd,0,SEEK_END);
    if ( FLAG_VERBOSE )
        printf("File size=%d\n",filesize);
    filebuf=malloc(filesize);    
    if (!filebuf) return 0;

    int now=0, loaded =0; 
    if (lseek(fd, 0, SEEK_SET) != 0) return 0;
    do
    {
        now = read(fd, filebuf+loaded, filesize-loaded);
        loaded+=now;
    } while (loaded<filesize && now);
         
    if ( loaded == filesize )
        return loaded;
    return -loaded;
}

char* b_get_buf

(

)

Definiert in Zeile 76 der Datei myio.c.

{
  return filebuf;
}

int b_read	(	void *	buf,
		int	count
	)

Definiert in Zeile 49 der Datei myio.c.

{
    if ( (filecuridx+count)> filesize)
        count = filesize - filecuridx;
    memcpy(buf, filebuf+filecuridx, count);
    filecuridx+=count;
    return count;
}

int b_seek

(

long

offset)

Definiert in Zeile 59 der Datei myio.c.

{
    filecuridx = offset;
    if ( offset < 0 )
     { filecuridx = 0;}
    else if ( offset > filesize)
     { filecuridx = filesize;}
    return filecuridx;
}

int b_seek_read	(	long	offset,
		char *	buf,
		int	len
	)

Definiert in Zeile 70 der Datei myio.c.

{
  if (b_seek(offset) != offset) return -1;
  return b_read(buf, len);
}

int find_import_symbol

(

char *

sym)

Definiert in Zeile 164 der Datei myio.c.

{
  static const char prefix[] = "__imported_";
  static int prefixsize = sizeof(prefix);

    if (import_counts<=0)
        return 0;

    if (strlen(sym)==0)
        return 0;

    if ( !strncmp( sym, prefix, prefixsize ) )
     { sym+=prefixsize; }

    int idx=0;

    for(;idx<import_counts;idx++) {
      if (strcmp(sym,import_syms[idx]) == 0)
        return (import_hash[idx]);
    }
    return 0;
}

char* get_import_symbol

(

unsigned

symidx)

Definiert in Zeile 188 der Datei myio.c.

{
    unsigned idx=0;

    for(;idx<symidx;idx++) {
      if (import_hash[idx] == symidx)
          return import_syms[idx];
    }

    return "";
}

int load_import

(

char *

importfile)

Definiert in Zeile 90 der Datei myio.c.

{
    int fd;
    static char buf[10];

    import_counts=0;
    import_buf=buf;
    if ( !importfile )
      return 0;

    fd=open(importfile, O_RDONLY|O_BINARY, 0777);

    if ( fd <=0 ) {
        PRINTERR(stderr,"No import file '%s' found\n",importfile);
        return 0;
    }
    importfilesize = lseek(fd,0,SEEK_END);
    if ( FLAG_VERBOSE )
        printf("Import file '%s' size=%d\n",importfile, importfilesize);

    import_buf=malloc(importfilesize+1);    
    if (!import_buf) return 0;

    int now=0, loaded =0; 
    if (lseek(fd, 0, SEEK_SET) != 0) return 0;
    do
    { 
      now = read(fd, import_buf+loaded, importfilesize-loaded);
      loaded+=now;
    } while (loaded<importfilesize && now);

    import_buf[loaded]=0;
    close(fd);
       
    if ( loaded != importfilesize )
      return -loaded;

    // Input file contains symbol hash value (in hex), a space and then the symbol name
    // Parse the input file and build the symbol / hash table
    char* p=import_buf;
    char* s=p;
    for (;*p;p++) {
        if (*p==13) {
            PRINTERR(stderr,"Import file should have unix EOL format\n");
            import_counts=0;
            break;
        }

        if (*p==10) {
            *p=0;
            unsigned int h;
            sscanf(s,"%x ",&h);
            import_syms[import_counts] = s+9;
            import_hash[import_counts] = h;
            import_counts++;
            s = p + 1;
            continue;
        }
        
        //if (!((*p>='A' && *p<='Z') || 
        //    (*p>='a' && *p<='z') || 
        //    (*p>='0' && *p<='9') || 
        //    *p=='_' ))
        //{
        //  PRINTERR(stderr,"Found '%c' sym. Import file should contain only symbol names. No spaces or other sym allowed\n",*p);
        //  break;
        //}
    }
    if ( FLAG_VERBOSE )
        printf("Import file has %d entries\n",import_counts);
    return loaded;
}

int load_stoplist

(

char *

stopfile)

Definiert in Zeile 214 der Datei myio.c.

{
    if ( !stopfile )
      return 0;

    int fd=open(stopfile, O_RDONLY|O_BINARY, 0777);

    if ( fd <=0 ) {
        PRINTERR(stderr,"No stoplist file '%s' found\n",stopfile);
        return 0;
    }
    int stoplistfilesize = lseek(fd,0,SEEK_END);
    if ( FLAG_VERBOSE )
        printf("Stoplist file '%s' size=%d\n",stopfile, stoplistfilesize);

    stoplist_buf=malloc(stoplistfilesize+1);    
    if (!stoplist_buf) return 0;

    int now=0, loaded =0; 
    if (lseek(fd, 0, SEEK_SET) != 0) return 0;
    do
    { 
      now = read(fd, stoplist_buf+loaded, stoplistfilesize-loaded);
      loaded+=now;
    } while (loaded<stoplistfilesize && now);

    stoplist_buf[loaded]=0;
    close(fd);
       
    if ( loaded != stoplistfilesize )
      return -loaded;

    // Parse
    struct StopListRecord record;
    char* sym=0, *finsym=0;
    char* cur=stoplist_buf;

    for ( ; cur<(stoplist_buf+stoplistfilesize); ) {
        for(;*cur==' '; cur++); // skip spaces

        sym=cur;
        for(;*cur && *cur!=9 && *cur!=' ' && *cur!=0x0a; cur++);
        if ( cur==sym ) {
            for(;*cur && *cur!=10; cur++);
            if ( *cur==10) {cur++;}
            continue;
        }

        record.symbol = sym;    
        record.warning = "Error: unsafe symbol used. Please check stoplist";
        finsym=cur;
        for(;*cur && *cur!=9 && *cur!=0x0a; cur++); // find \t

        if ( *cur==0 ) break;
        if ( *cur==9 ) {
            cur++;
            record.warning=cur;
        }
        
        for(;*cur && *cur!=10; cur++);      // find eol
        if ( *cur==0x0a && cur>stoplist_buf && *(cur-1)==0x0d)
            *(cur-1)=0;

        if (cur==record.warning)
            record.warning = "Error: unsafe symbol used. Please check stoplist";

        record.next=stoplisthead;
        stoplisthead = malloc (sizeof(struct StopListRecord));
        memcpy( stoplisthead, &record, sizeof(struct StopListRecord));

        if ( *cur!=0 ) { *cur=0; cur++;}
        *finsym = 0;

        if ( FLAG_VERBOSE )
            printf("Stop record: %s => %s\n",record.symbol, record.warning);
    }

    return loaded;
}

void raise_error

(

)

Definiert in Zeile 313 der Datei myio.c.

{
  static int flag =0;

  if (!flag)
    fprintf(stderr, "In file %s:\n", filename_elf);
  flag=1;
}

int stoplist_check

(

char *

sym)

Definiert in Zeile 295 der Datei myio.c.

{
    struct StopListRecord *cur;
  
    for ( cur = stoplisthead; cur; cur = cur->next ) {
        if ( !cur->symbol )
            continue;
        if ( !strcmp( sym, cur->symbol) ) {
            PRINTERR(stderr,"%s\n",cur->warning);
            cur->symbol = 0;  // mark that this symbol is already warned
            return 1;
        }
    }
    return 0;
}

Variablen-Dokumentation

char* filebuf =0

static

Definiert in Zeile 15 der Datei myio.c.

int filecuridx =0

static

Definiert in Zeile 17 der Datei myio.c.

int filesize =0

static

Definiert in Zeile 16 der Datei myio.c.

char* import_buf =0

static

Definiert in Zeile 84 der Datei myio.c.

int import_counts =0

static

Definiert in Zeile 87 der Datei myio.c.

unsigned int import_hash[MAX_SYM]

static

Definiert in Zeile 86 der Datei myio.c.

char* import_syms[MAX_SYM]

static

Definiert in Zeile 85 der Datei myio.c.

int importfilesize =0

static

Definiert in Zeile 88 der Datei myio.c.

char* stoplist_buf =0

Definiert in Zeile 210 der Datei myio.c.

struct StopListRecord* stoplisthead =0

Definiert in Zeile 211 der Datei myio.c.