FreeCalypso > hg > fc-am-toolkit

annotate bootmatch/comp_output.c @ 22:873d5f33e8f3

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doc: beginning with FC-aftermarket-intro
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 11 Jun 2023 06:18:53 +0000
parents 39b921d851fb
children
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9
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1 /*
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2 * This module is the output stage of our bootmatch compiler.
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3 */
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4
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5 #include <sys/types.h>
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6 #include <stdio.h>
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7 #include <stdlib.h>
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8 #include "comp_defs.h"
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9
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10 extern u_char boot_image[BOOT_BLOCK_SIZE];
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11 extern struct range range_list[MAX_RANGES];
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12 extern unsigned range_count;
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13 extern char *output_array_name;
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14
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15 static FILE *outf;
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16
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17 static void
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18 emit_header()
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19 {
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20 fputs("#include <sys/types.h>\n", outf);
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21 fputs("#include \"bootmatch.h\"\n", outf);
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22 putc('\n', outf);
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23 }
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24
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25 static void
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26 emit_refbytes_chunk(rp)
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27 struct range *rp;
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28 {
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29 u_char *dp, *endp;
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30 unsigned linelen;
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31
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32 fprintf(outf, "static u_char refbytes_%04X[%u] = {\n", rp->offset,
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33 rp->nbytes);
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34 dp = boot_image + rp->offset;
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35 endp = dp + rp->nbytes;
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36 linelen = 0;
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37 while (dp < endp) {
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38 if (linelen >= 16) {
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39 putc('\n', outf);
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40 linelen = 0;
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41 }
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42 fprintf(outf, "0x%02X", *dp++);
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43 if (dp < endp)
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44 putc(',', outf);
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45 linelen++;
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46 }
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47 fputs("\n};\n\n", outf);
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48 }
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49
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50 static void
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51 emit_refbytes_all()
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52 {
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53 unsigned n;
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54
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55 for (n = 0; n < range_count; n++)
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56 emit_refbytes_chunk(range_list + n);
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57 }
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58
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59 static void
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60 emit_bootmatch_array()
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61 {
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62 unsigned n;
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63 struct range *rp;
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64
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65 fprintf(outf, "struct bootmatch %s[] = {\n", output_array_name);
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66 for (n = 0; n < range_count; n++) {
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67 rp = range_list + n;
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68 fprintf(outf, "\t{0x%04X, 0x%04X, refbytes_%04X},\n",
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69 rp->offset, rp->nbytes, rp->offset);
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70 }
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71 fputs("\t{0, 0, 0}\n};\n", outf);
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72 }
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73
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74 void
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75 emit_output_file(filename)
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76 char *filename;
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77 {
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78 outf = fopen(filename, "w");
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79 if (!outf) {
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80 perror(filename);
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81 exit(1);
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82 }
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83 emit_header();
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84 emit_refbytes_all();
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85 emit_bootmatch_array();
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86 fclose(outf);
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87 }