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annotate fteeprom/read_eeprom_image.c @ 82:2c135bde4dd0

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doc/CP2102-EEPROM-format: new article
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 27 Sep 2023 01:44:27 +0000
parents ca2250b4833d
children
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1 /*
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2 * This module implements functions for reading FTDI EEPROM images
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3 * from a file or from stdin.
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4 */
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5
0
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6 #include <sys/types.h>
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7 #include <ctype.h>
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8 #include <string.h>
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9 #include <strings.h>
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10 #include <stdio.h>
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11 #include <stdlib.h>
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12
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13 unsigned eeprom_size;
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14 u_short eeprom[256];
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15
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16 read_eeprom_common(inf, filename_for_errs)
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17 FILE *inf;
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18 char *filename_for_errs;
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19 {
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20 char linebuf[1024], *cp;
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21 int lineno, rc;
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22 unsigned ptr = 0, input_off;
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23
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24 for (lineno = 1; fgets(linebuf, sizeof linebuf, inf); lineno++) {
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25 for (cp = linebuf; isspace(*cp); cp++)
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26 ;
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27 if (*cp == '\0' || *cp == '#')
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28 continue;
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29 if (ptr >= 256) {
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30 fprintf(stderr,
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31 "%s line %d: maximum EEPROM size exceeded\n",
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32 filename_for_errs, lineno);
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33 exit(1);
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34 }
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35 rc = sscanf(linebuf, "%x: %hx %hx %hx %hx %hx %hx %hx %hx",
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36 &input_off, eeprom + ptr, eeprom + ptr + 1,
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37 eeprom + ptr + 2, eeprom + ptr + 3,
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38 eeprom + ptr + 4, eeprom + ptr + 5,
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39 eeprom + ptr + 6, eeprom + ptr + 7);
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40 if (rc != 9 || input_off != ptr * 2) {
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41 fprintf(stderr, "%s line %d: invalid input\n",
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42 filename_for_errs, lineno);
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43 exit(1);
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44 }
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45 ptr += 8;
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46 }
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47 if (ptr != 64 && ptr != 128 && ptr != 256) {
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48 fprintf(stderr, "%s: not an EEPROM image of recognized size\n",
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49 filename_for_errs);
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50 exit(1);
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51 }
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52 eeprom_size = ptr;
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53 }
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54
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55 read_eeprom_from_file(filename)
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56 char *filename;
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57 {
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58 FILE *inf;
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59
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60 inf = fopen(filename, "r");
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61 if (!inf) {
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62 perror(filename);
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63 exit(1);
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64 }
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65 read_eeprom_common(inf, filename);
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66 fclose(inf);
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67 }
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68
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69 read_eeprom_from_stdin()
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70 {
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71 read_eeprom_common(stdin, "stdin");
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72 }