77 lines
2.0 KiB
C
77 lines
2.0 KiB
C
/*
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* gnu_load for mdb.c
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*/
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#include <stdio.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <gnu/a.out.h>
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_PROTOTYPE( unsigned int gnu_load, (char *filename, struct nlist **start) );
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_PROTOTYPE( void do_error, (char *message) );
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unsigned int gnu_load( filename, start)
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char *filename;
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struct nlist **start;
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{
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struct exec header;
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unsigned int nsym, string_size;
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char *names;
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struct nlist *p;
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int fd;
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if ( (fd = open( filename, 0)) < 0 ||
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read( fd, (char *) &header, sizeof header ) != sizeof header )
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{
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do_error( "gnu_load" );
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if ( fd >= 0) close( fd );
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return 0;
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}
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if ( lseek( fd, N_STROFF( header ), 0 ) != N_STROFF( header ) )
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{
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do_error( "gnu_load - reading header" );
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close( fd );
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return 0;
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}
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if ( read( fd, (char *) &string_size, sizeof string_size ) < 0 )
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{
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do_error( "gnu_load - reading header" );
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close( fd );
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return 0;
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}
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if ( (int) header.a_syms < 0 ||
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(unsigned) header.a_syms != header.a_syms ||
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(*start = (struct nlist *) malloc( (unsigned) header.a_syms +
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string_size ))
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== (struct nlist *) NULL &&
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header.a_syms != 0 )
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{
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close( fd );
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return 0;
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}
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lseek( fd, N_SYMOFF( header ), 0 );
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if ( read( fd, (char *) *start, (int) header.a_syms + string_size ) < 0 )
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{
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do_error( "gnu_load - reading symbols" );
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close( fd );
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return 0;
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}
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close( fd );
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nsym = (unsigned int) header.a_syms / sizeof (struct nlist);
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names = (char *) *start + header.a_syms;
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for ( p = *start; p < *start + nsym; p++)
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if(p->n_un.n_strx)
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p->n_un.n_name = names + p->n_un.n_strx;
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return nsym;
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}
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