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[/] [eco32/] [trunk/] [disk/] [diskserv/] [diskserv.c] - Blame information for rev 176

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/*
 * diskserv.c -- serial line disk server
 */
 
 
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <fcntl.h>
#include <unistd.h>
#include <termios.h>
 
 
#define SYN             0x16
#define ACK             0x06
 
#define RESULT_OK       0x00
#define RESULT_UNCMD    0x01
#define RESULT_TOOBIG   0x02
#define RESULT_POSERR   0x03
#define RESULT_RDERR    0x04
#define RESULT_WRERR    0x05
 
 
static int debugCmds = 1;
static int debugData = 0;
 
static FILE *diskFile = NULL;
static unsigned int numSectors;
static int sfd = 0;
static struct termios origOptions;
static struct termios currOptions;
 
 
void serialClose(void);
 
 
void error(char *fmt, ...) {
  va_list ap;
 
  va_start(ap, fmt);
  printf("Error: ");
  vprintf(fmt, ap);
  printf("\n");
  va_end(ap);
  if (diskFile != NULL) {
    fclose(diskFile);
    diskFile = NULL;
  }
  if (sfd != 0) {
    serialClose();
    sfd = 0;
  }
  exit(1);
}
 
 
void serialOpen(char *serialPort) {
  sfd = open(serialPort, O_RDWR | O_NOCTTY | O_NDELAY);
  if (sfd == -1) {
    error("cannot open serial port '%s'", serialPort);
  }
  tcgetattr(sfd, &origOptions);
  currOptions = origOptions;
  cfsetispeed(&currOptions, B38400);
  cfsetospeed(&currOptions, B38400);
  currOptions.c_cflag |= (CLOCAL | CREAD);
  currOptions.c_cflag &= ~PARENB;
  currOptions.c_cflag &= ~CSTOPB;
  currOptions.c_cflag &= ~CSIZE;
  currOptions.c_cflag |= CS8;
  currOptions.c_cflag &= ~CRTSCTS;
  currOptions.c_lflag &= ~(ICANON | ECHO | ECHONL | ISIG | IEXTEN);
  currOptions.c_iflag &= ~(IGNBRK | BRKINT | IGNPAR | PARMRK);
  currOptions.c_iflag &= ~(INPCK | ISTRIP | INLCR | IGNCR | ICRNL);
  currOptions.c_iflag &= ~(IXON | IXOFF | IXANY);
  currOptions.c_oflag &= ~(OPOST | ONLCR | OCRNL | ONOCR | ONLRET);
  tcsetattr(sfd, TCSANOW, &currOptions);
}
 
 
void serialClose(void) {
  tcsetattr(sfd, TCSANOW, &origOptions);
  close(sfd);
}
 
 
int serialSnd(unsigned char b) {
  int n;
 
  n = write(sfd, &b, 1);
  return n == 1;
}
 
 
int serialRcv(unsigned char *bp) {
  int n;
 
  n = read(sfd, bp, 1);
  return n == 1;
}
 
 
void connect(void) {
  unsigned char b;
 
  printf("SYN... ");
  fflush(stdout);
  while (!serialSnd(ACK)) ;
  tcdrain(sfd);
  printf("ACK... ");
  fflush(stdout);
  while (!serialRcv(&b)) ;
  if (b != ACK) {
    error("cannot synchronize with client");
  }
  printf("connected\n");
}
 
 
void sendResult(unsigned char result) {
  while (!serialSnd(result)) ;
  tcdrain(sfd);
}
 
 
void showData(unsigned char buffer[512]) {
  int i, j;
  unsigned char c;
 
  for (i = 0; i < 32; i++) {
    printf("%03X   ", i * 16);
    for (j = 0; j < 16; j++) {
      c = buffer[i * 16 + j];
      printf("%02X ", c);
    }
    printf("  ");
    for (j = 0; j < 16; j++) {
      c = buffer[i * 16 + j];
      if (c >= 0x20 && c < 0x7F) {
        printf("%c", c);
      } else {
        printf(".");
      }
    }
    printf("\n");
  }
}
 
 
int main(int argc, char *argv[]) {
  char *serialPort;
  char *diskName;
  int i;
  unsigned char b;
  unsigned char cmd;
  unsigned int sector;
  unsigned char buffer[512];
 
  if (argc != 3) {
    printf("Usage: %s <serial port> <disk image file>\n", argv[0]);
    exit(1);
  }
  serialPort = argv[1];
  diskName = argv[2];
  diskFile = fopen(diskName, "r+b");
  if (diskFile == NULL) {
    error("cannot open disk image file '%s'", diskName);
  }
  fseek(diskFile, 0, SEEK_END);
  numSectors = ftell(diskFile) / 512;
  fseek(diskFile, 0, SEEK_SET);
  printf("Disk '%s' has 0x%08X sectors.\n", diskName, numSectors);
  /* open serial interface */
  serialOpen(serialPort);
  /* wait for client to connect */
  printf("Waiting for client...\n");
  while (1) {
    if (serialRcv(&b) && b == SYN) {
      break;
    }
  }
  connect();
  /* connected, now handle requests */
  while (1) {
    while (!serialRcv(&cmd)) ;
    if (cmd == 'q') {
      /* for tests only, a real client would never quit */
      if (debugCmds) {
        printf("quit\n");
      }
      break;
    }
    if (cmd == SYN) {
      /* this happens if the client has been reset */
      connect();
      continue;
    }
    if (cmd == 'c') {
      /* client asks for disk capacity */
      sendResult(RESULT_OK);
      for (i = 0; i < 4; i++) {
        b = (numSectors >> (8 * (3 - i))) & 0xFF;
        while (!serialSnd(b)) ;
      }
      tcdrain(sfd);
      if (debugCmds) {
        printf("capacity... OK\n");
      }
      continue;
    }
    if (cmd != 'r' && cmd != 'w') {
      /* unknown command */
      sendResult(RESULT_UNCMD);
      if (debugCmds) {
        printf("unknown... UNCMD\n");
      }
      continue;
    }
    /* only read and write requests get here */
    sector = 0;
    for (i = 0; i < 4; i++) {
      while (!serialRcv(&b)) ;
      sector = (sector << 8) | b;
    }
    if (cmd == 'r') {
      if (debugCmds) {
        printf("reading sector 0x%08X... ", sector);
        fflush(stdout);
      }
      if (sector >= numSectors) {
        sendResult(RESULT_TOOBIG);
        if (debugCmds) {
          printf("TOOBIG\n");
        }
      } else
      if (fseek(diskFile, sector * 512, SEEK_SET) != 0) {
        sendResult(RESULT_POSERR);
        if (debugCmds) {
          printf("POSERR\n");
        }
      } else
      if (fread(buffer, 1, 512, diskFile) != 512) {
        sendResult(RESULT_RDERR);
        if (debugCmds) {
          printf("RDERR\n");
        }
      } else {
        sendResult(RESULT_OK);
        for (i = 0; i < 512; i++) {
          while (!serialSnd(buffer[i])) ;
        }
        tcdrain(sfd);
        if (debugCmds) {
          printf("OK\n");
        }
        if (debugData) {
          showData(buffer);
        }
      }
      continue;
    }
    if (cmd == 'w') {
      if (debugCmds) {
        printf("writing sector 0x%08X... ", sector);
        fflush(stdout);
      }
      for (i = 0; i < 512; i++) {
        while (!serialRcv(buffer + i)) ;
      }
      if (sector >= numSectors) {
        sendResult(RESULT_TOOBIG);
        if (debugCmds) {
          printf("TOOBIG\n");
        }
      } else
      if (fseek(diskFile, sector * 512, SEEK_SET) != 0) {
        sendResult(RESULT_POSERR);
        if (debugCmds) {
          printf("POSERR\n");
        }
      } else
      if (fwrite(buffer, 1, 512, diskFile) != 512) {
        sendResult(RESULT_WRERR);
        if (debugCmds) {
          printf("WRERR\n");
        }
      } else {
        sendResult(RESULT_OK);
        if (debugCmds) {
          printf("OK\n");
        }
        if (debugData) {
          showData(buffer);
        }
      }
      continue;
    }
  }
  if (diskFile != NULL) {
    fclose(diskFile);
    diskFile = NULL;
  }
  if (sfd != 0) {
    serialClose();
    sfd = 0;
  }
  return 0;
}

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[/] [eco32/] [trunk/] [disk/] [diskserv/] [diskserv.c] - Blame information for rev 176

Line No.	Rev	Author	Line
1	17	hellwig	`/*`
2			`* diskserv.c -- serial line disk server`
3			`*/`
4
5
6			`#include <stdio.h>`
7			`#include <stdlib.h>`
8			`#include <string.h>`
9			`#include <stdarg.h>`
10			`#include <fcntl.h>`
11			`#include <unistd.h>`
12			`#include <termios.h>`
13
14
15			`#define SYN 0x16`
16			`#define ACK 0x06`
17
18			`#define RESULT_OK 0x00`
19			`#define RESULT_UNCMD 0x01`
20			`#define RESULT_TOOBIG 0x02`
21			`#define RESULT_POSERR 0x03`
22			`#define RESULT_RDERR 0x04`
23			`#define RESULT_WRERR 0x05`
24
25
26			`static int debugCmds = 1;`
27			`static int debugData = 0;`
28
29			`static FILE *diskFile = NULL;`
30			`static unsigned int numSectors;`
31			`static int sfd = 0;`
32			`static struct termios origOptions;`
33			`static struct termios currOptions;`
34
35
36			`void serialClose(void);`
37
38
39			`void error(char *fmt, ...) {`
40			`va_list ap;`
41
42			`va_start(ap, fmt);`
43			`printf("Error: ");`
44			`vprintf(fmt, ap);`
45			`printf("\n");`
46			`va_end(ap);`
47			`if (diskFile != NULL) {`
48			`fclose(diskFile);`
49			`diskFile = NULL;`
50			`}`
51			`if (sfd != 0) {`
52			`serialClose();`
53			`sfd = 0;`
54			`}`
55			`exit(1);`
56			`}`
57
58
59	48	hellwig	`void serialOpen(char *serialPort) {`
60			`sfd = open(serialPort, O_RDWR \| O_NOCTTY \| O_NDELAY);`
61	17	hellwig	`if (sfd == -1) {`
62	48	hellwig	`error("cannot open serial port '%s'", serialPort);`
63	17	hellwig	`}`
64			`tcgetattr(sfd, &origOptions);`
65			`currOptions = origOptions;`
66			`cfsetispeed(&currOptions, B38400);`
67			`cfsetospeed(&currOptions, B38400);`
68			`currOptions.c_cflag \|= (CLOCAL \| CREAD);`
69			`currOptions.c_cflag &= ~PARENB;`
70			`currOptions.c_cflag &= ~CSTOPB;`
71			`currOptions.c_cflag &= ~CSIZE;`
72			`currOptions.c_cflag \|= CS8;`
73			`currOptions.c_cflag &= ~CRTSCTS;`
74			`currOptions.c_lflag &= ~(ICANON \| ECHO \| ECHONL \| ISIG \| IEXTEN);`
75			`currOptions.c_iflag &= ~(IGNBRK \| BRKINT \| IGNPAR \| PARMRK);`
76			`currOptions.c_iflag &= ~(INPCK \| ISTRIP \| INLCR \| IGNCR \| ICRNL);`
77			`currOptions.c_iflag &= ~(IXON \| IXOFF \| IXANY);`
78			`currOptions.c_oflag &= ~(OPOST \| ONLCR \| OCRNL \| ONOCR \| ONLRET);`
79			`tcsetattr(sfd, TCSANOW, &currOptions);`
80			`}`
81
82
83			`void serialClose(void) {`
84			`tcsetattr(sfd, TCSANOW, &origOptions);`
85			`close(sfd);`
86			`}`
87
88
89			`int serialSnd(unsigned char b) {`
90			`int n;`
91
92			`n = write(sfd, &b, 1);`
93			`return n == 1;`
94			`}`
95
96
97			`int serialRcv(unsigned char *bp) {`
98			`int n;`
99
100			`n = read(sfd, bp, 1);`
101			`return n == 1;`
102			`}`
103
104
105			`void connect(void) {`
106			`unsigned char b;`
107
108			`printf("SYN... ");`
109			`fflush(stdout);`
110			`while (!serialSnd(ACK)) ;`
111			`tcdrain(sfd);`
112			`printf("ACK... ");`
113			`fflush(stdout);`
114			`while (!serialRcv(&b)) ;`
115			`if (b != ACK) {`
116			`error("cannot synchronize with client");`
117			`}`
118			`printf("connected\n");`
119			`}`
120
121
122			`void sendResult(unsigned char result) {`
123			`while (!serialSnd(result)) ;`
124			`tcdrain(sfd);`
125			`}`
126
127
128			`void showData(unsigned char buffer[512]) {`
129			`int i, j;`
130			`unsigned char c;`
131
132			`for (i = 0; i < 32; i++) {`
133			`printf("%03X ", i * 16);`
134			`for (j = 0; j < 16; j++) {`
135			`c = buffer[i * 16 + j];`
136			`printf("%02X ", c);`
137			`}`
138			`printf(" ");`
139			`for (j = 0; j < 16; j++) {`
140			`c = buffer[i * 16 + j];`
141			`if (c >= 0x20 && c < 0x7F) {`
142			`printf("%c", c);`
143			`} else {`
144			`printf(".");`
145			`}`
146			`}`
147			`printf("\n");`
148			`}`
149			`}`
150
151
152			`int main(int argc, char *argv[]) {`
153	48	hellwig	`char *serialPort;`
154	17	hellwig	`char *diskName;`
155			`int i;`
156			`unsigned char b;`
157			`unsigned char cmd;`
158			`unsigned int sector;`
159			`unsigned char buffer[512];`
160
161	48	hellwig	`if (argc != 3) {`
162			`printf("Usage: %s <serial port> <disk image file>\n", argv[0]);`
163	17	hellwig	`exit(1);`
164			`}`
165	48	hellwig	`serialPort = argv[1];`
166			`diskName = argv[2];`
167	17	hellwig	`diskFile = fopen(diskName, "r+b");`
168			`if (diskFile == NULL) {`
169			`error("cannot open disk image file '%s'", diskName);`
170			`}`
171			`fseek(diskFile, 0, SEEK_END);`
172			`numSectors = ftell(diskFile) / 512;`
173			`fseek(diskFile, 0, SEEK_SET);`
174			`printf("Disk '%s' has 0x%08X sectors.\n", diskName, numSectors);`
175			`/* open serial interface */`
176	48	hellwig	`serialOpen(serialPort);`
177	17	hellwig	`/* wait for client to connect */`
178			`printf("Waiting for client...\n");`
179			`while (1) {`
180			`if (serialRcv(&b) && b == SYN) {`
181			`break;`
182			`}`
183			`}`
184			`connect();`
185			`/* connected, now handle requests */`
186			`while (1) {`
187			`while (!serialRcv(&cmd)) ;`
188			`if (cmd == 'q') {`
189			`/* for tests only, a real client would never quit */`
190			`if (debugCmds) {`
191			`printf("quit\n");`
192			`}`
193			`break;`
194			`}`
195			`if (cmd == SYN) {`
196			`/* this happens if the client has been reset */`
197			`connect();`
198			`continue;`
199			`}`
200			`if (cmd == 'c') {`
201			`/* client asks for disk capacity */`
202			`sendResult(RESULT_OK);`
203			`for (i = 0; i < 4; i++) {`
204			`b = (numSectors >> (8 * (3 - i))) & 0xFF;`
205			`while (!serialSnd(b)) ;`
206			`}`
207			`tcdrain(sfd);`
208			`if (debugCmds) {`
209			`printf("capacity... OK\n");`
210			`}`
211			`continue;`
212			`}`
213			`if (cmd != 'r' && cmd != 'w') {`
214			`/* unknown command */`
215			`sendResult(RESULT_UNCMD);`
216			`if (debugCmds) {`
217			`printf("unknown... UNCMD\n");`
218			`}`
219			`continue;`
220			`}`
221			`/* only read and write requests get here */`
222			`sector = 0;`
223			`for (i = 0; i < 4; i++) {`
224			`while (!serialRcv(&b)) ;`
225			`sector = (sector << 8) \| b;`
226			`}`
227			`if (cmd == 'r') {`
228			`if (debugCmds) {`
229			`printf("reading sector 0x%08X... ", sector);`
230			`fflush(stdout);`
231			`}`
232			`if (sector >= numSectors) {`
233			`sendResult(RESULT_TOOBIG);`
234			`if (debugCmds) {`
235			`printf("TOOBIG\n");`
236			`}`
237			`} else`
238			`if (fseek(diskFile, sector * 512, SEEK_SET) != 0) {`
239			`sendResult(RESULT_POSERR);`
240			`if (debugCmds) {`
241			`printf("POSERR\n");`
242			`}`
243			`} else`
244			`if (fread(buffer, 1, 512, diskFile) != 512) {`
245			`sendResult(RESULT_RDERR);`
246			`if (debugCmds) {`
247			`printf("RDERR\n");`
248			`}`
249			`} else {`
250			`sendResult(RESULT_OK);`
251			`for (i = 0; i < 512; i++) {`
252			`while (!serialSnd(buffer[i])) ;`
253			`}`
254			`tcdrain(sfd);`
255			`if (debugCmds) {`
256			`printf("OK\n");`
257			`}`
258			`if (debugData) {`
259			`showData(buffer);`
260			`}`
261			`}`
262			`continue;`
263			`}`
264			`if (cmd == 'w') {`
265			`if (debugCmds) {`
266			`printf("writing sector 0x%08X... ", sector);`
267			`fflush(stdout);`
268			`}`
269			`for (i = 0; i < 512; i++) {`
270			`while (!serialRcv(buffer + i)) ;`
271			`}`
272			`if (sector >= numSectors) {`
273			`sendResult(RESULT_TOOBIG);`
274			`if (debugCmds) {`
275			`printf("TOOBIG\n");`
276			`}`
277			`} else`
278			`if (fseek(diskFile, sector * 512, SEEK_SET) != 0) {`
279			`sendResult(RESULT_POSERR);`
280			`if (debugCmds) {`
281			`printf("POSERR\n");`
282			`}`
283			`} else`
284			`if (fwrite(buffer, 1, 512, diskFile) != 512) {`
285			`sendResult(RESULT_WRERR);`
286			`if (debugCmds) {`
287			`printf("WRERR\n");`
288			`}`
289			`} else {`
290			`sendResult(RESULT_OK);`
291			`if (debugCmds) {`
292			`printf("OK\n");`
293			`}`
294			`if (debugData) {`
295			`showData(buffer);`
296			`}`
297			`}`
298			`continue;`
299			`}`
300			`}`
301			`if (diskFile != NULL) {`
302			`fclose(diskFile);`
303			`diskFile = NULL;`
304			`}`
305			`if (sfd != 0) {`
306			`serialClose();`
307			`sfd = 0;`
308			`}`
309			`return 0;`
310			`}`