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@@ -0,0 +1,68 @@ |
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#include <stdlib.h> |
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#include <stdio.h> |
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#include <fcntl.h> |
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#include <unistd.h> |
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/* Read specified number of bytes at specified memory address through a BASIC |
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* remote shell and dump it to stdout. |
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*/ |
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void sendcmd(int fd, char *cmd) |
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{ |
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char junk[2]; |
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while (*cmd) { |
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write(fd, cmd, 1); |
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read(fd, &junk, 1); |
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cmd++; |
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// The other side is sometimes much slower than us and if we don't let |
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// it breathe, it can choke. |
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usleep(1000); |
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} |
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write(fd, "\n", 1); |
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read(fd, &junk, 2); // sends back \r\n |
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usleep(1000); |
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} |
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int main(int argc, char **argv) |
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{ |
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if (argc != 4) { |
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fprintf(stderr, "Usage: ./memdump device memptr bytecount\n"); |
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return 1; |
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} |
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unsigned int memptr = strtol(argv[2], NULL, 16); |
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unsigned int bytecount = strtol(argv[3], NULL, 16); |
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fprintf(stderr, "memptr: 0x%04x bytecount: 0x%04x.\n", memptr, bytecount); |
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if (memptr+bytecount > 0xffff) { |
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fprintf(stderr, "memptr+bytecount out of range.\n"); |
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return 1; |
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} |
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if (!bytecount) { |
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// nothing to spit |
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return 0; |
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} |
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int fd = open(argv[1], O_RDWR|O_NOCTTY); |
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char s[0x20]; |
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sprintf(s, "m=0x%04x", memptr); |
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sendcmd(fd, s); |
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read(fd, s, 2); // read prompt |
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for (int i=0; i<bytecount; i++) { |
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sendcmd(fd, "peek m"); |
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read(fd, s, 2); // read prompt |
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sendcmd(fd, "print a"); |
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for (int j=0; j<3; j++) { |
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read(fd, s+j, 1); |
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s[j+1] = 0; // always null-terminate |
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if (s[j] < '0') { |
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break; |
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} |
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} |
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unsigned char c = strtol(s, NULL, 10); |
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putchar(c); |
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read(fd, s, 3); // read \r\n + prompt - last char |
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sendcmd(fd, "m=m+1"); |
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read(fd, s, 2); // read prompt |
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} |
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return 0; |
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} |