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111 lines
2.6 KiB
C
111 lines
2.6 KiB
C
/*
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** simple file I/O test
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**
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** 12-Jun-2000, Christian Groessler
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**
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** please compile with
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** cl65 -tsystem ft.c getsp.s -o ft.com
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**
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** The program asks for a filename (if it hasn't
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** got one from argv). I then opens the file,
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** reads the the first 16 bytes and displays them
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** (as hex values).
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** The values of sp (cc65 runtime stack pointer)
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** are displayed at some places. The displayed
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** value should always be the same.
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*/
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#include <stdio.h>
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#include <string.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <conio.h>
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#include <unistd.h>
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extern int getsp(void); /* is provided in getsp.s */
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/* Atari's fd indirection table */
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#ifdef __ATARI__
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extern char __fd_index[];
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struct fd_t {
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char usage;
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char iocb;
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char dev;
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char flag;
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};
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extern struct fd_t __fd_table[];
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#endif
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int main(int argc,char **argv)
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{
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char *filename,*x;
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char buf[20];
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int i,l,lr;
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int fd;
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int csp;
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if (argc >= 2) {
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filename = *(argv+1);
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}
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else {
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printf("\nfilename: ");
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x = fgets(buf,19,stdin);
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printf("\n");
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if (!x) {
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printf("nothing read\n");
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return(0);
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}
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#if 0
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l = strlen(x);
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printf("read: ");
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for (i=0; i<l; i++) printf("%02X ",*(x+i)); printf("\n");
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#endif
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filename = x;
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}
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printf("using filename \"%s\"\n",filename);
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csp = getsp();
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printf("now opening file... sp = %d\n",csp);
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fd = open(filename,O_RDONLY);
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csp = getsp();
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if (fd == -1) {
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char x1 = _oserror;
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printf("open failed: os: %d,\n\terrno: %d, sp = %d\n",x1,errno,csp);
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cgetc();
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return(0);
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}
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printf("open success -- handle = $%x, sp = %d\n",fd,csp);
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#ifdef __ATARI__
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printf("fd_index:\n ");
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for (i=0; i<12; i++) printf("%02X ",__fd_index[i]);
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printf("\nfd_table:\n");
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for (i=0; i<8; i++) {
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printf(" usa: %d, iocb: %02X, dev: %02X\n",
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__fd_table[i].usage,
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__fd_table[i].iocb,
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__fd_table[i].dev);
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}
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#endif
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lr = read(fd,buf,16); /* read first 16 bytes */
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csp = getsp();
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if (lr == -1) {
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printf("read failed: %d (sp = %d)\n",errno,csp);
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cgetc();
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return(0);
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}
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l = close(fd);
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if (l == -1) {
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printf("close failed: %d\n",errno);
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cgetc();
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return(0);
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}
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csp = getsp();
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printf("\n\nThe data read: (%d bytes, sp = %d)\n",lr,csp);
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for (i=0; i<lr; i++) {
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printf("%02X ",buf[i]);
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if (!((i+1) & 7)) printf("\n");
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}
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printf("\n\npress return to exit...");
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getchar();
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return(0);
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}
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