FreeCalypso > hg > freecalypso-tools

annotate rvinterf/ctracedec/decode.c @ 407:19e5a3e2f9c0

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fcup-settime: moved time() retrieval a little closer to the output A fundamental problem with all simple time transfer tools is that there is always some delay between the time retrieval on the source system and that transmitted time being set on the destination, and the resulting time on the destination system is off by that delay amount. This delay cannot be fully eliminated when working in a simple environment like ours, but we should make our best effort to minimize it. In the present case, moving the atinterf_init() call before the time() retrieval should make a teensy-tiny improvement.
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 11 Aug 2018 21:52:17 +0000
parents e7502631a0f9
children
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0
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1 /*
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2 * This module implements the actual decoding of compressed traces.
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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 <ctype.h>
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8 #include <string.h>
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9 #include <strings.h>
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10 #include <stdlib.h>
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11
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12 extern char *str2ind_tab_filename;
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13 extern int str2ind_array_size;
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14 extern char **str2ind_orig_strings;
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15 extern char **str2ind_param_strings;
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16
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17 #define MAX_PRINTF_PARAMS 16
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18
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19 static int cindex, cindex_nchars;
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20 static u_char param_bytes_array[256];
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Mychaela Falconia <falcon@freecalypso.org>
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21 static int param_bytes_count;
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Mychaela Falconia <falcon@freecalypso.org>
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22 static char *format_string, *param_type_string;
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Mychaela Falconia <falcon@freecalypso.org>
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23 static int num_printf_params;
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24 static u_long printf_params[MAX_PRINTF_PARAMS];
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25 static char output_buf[2048];
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26
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Mychaela Falconia <falcon@freecalypso.org>
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27 decode_hex_digit(c)
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Mychaela Falconia <falcon@freecalypso.org>
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28 {
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29 if (isdigit(c))
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30 return(c - '0');
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31 else if (isupper(c))
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32 return(c - 'A' + 10);
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33 else
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34 return(c - 'a' + 10);
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35 }
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36
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37 static int
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Mychaela Falconia <falcon@freecalypso.org>
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38 decode_idx_and_params(line)
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Mychaela Falconia <falcon@freecalypso.org>
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39 char *line;
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Mychaela Falconia <falcon@freecalypso.org>
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40 {
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41 char *cp;
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Mychaela Falconia <falcon@freecalypso.org>
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42 u_char *dp;
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43
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44 for (cp = line; isdigit(*cp); cp++)
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Mychaela Falconia <falcon@freecalypso.org>
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45 ;
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Mychaela Falconia <falcon@freecalypso.org>
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46 if (*cp && *cp != ' ')
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47 return(-1);
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Mychaela Falconia <falcon@freecalypso.org>
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48 cindex = atoi(line);
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49 cindex_nchars = cp - line;
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50 for (dp = param_bytes_array; *cp; ) {
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51 if (*cp++ != ' ')
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52 return(-1);
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Mychaela Falconia <falcon@freecalypso.org>
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53 if (!isxdigit(cp[0]) || !isxdigit(cp[1]))
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54 return(-1);
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55 *dp++ = decode_hex_digit(cp[0]) << 4 | decode_hex_digit(cp[1]);
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56 cp += 2;
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57 }
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58 param_bytes_count = dp - param_bytes_array;
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59 return(0);
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60 }
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61
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62 static void
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63 decode_parameters(filename_for_errs, lineno_for_errs)
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Mychaela Falconia <falcon@freecalypso.org>
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64 char *filename_for_errs;
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65 {
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66 int pi, type;
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Mychaela Falconia <falcon@freecalypso.org>
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67 u_char *bp, *endp;
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68
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69 bp = param_bytes_array;
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70 endp = bp + param_bytes_count;
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71 for (pi = 0; pi < num_printf_params; pi++) {
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72 type = param_type_string[pi];
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73 switch (type) {
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74 case 'c':
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75 if (bp >= endp) {
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76 wrong_param_byte_count: fprintf(stderr,
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77 "%s line %d: wrong number of parameter bytes for %s entry #%d\n",
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78 filename_for_errs, lineno_for_errs,
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Mychaela Falconia <falcon@freecalypso.org>
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79 str2ind_tab_filename, cindex);
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80 exit(1);
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81 }
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82 printf_params[pi] = *bp++;
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83 continue;
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84 case 'i':
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85 case 'p':
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86 case '*':
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87 if (bp > endp - 4)
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88 goto wrong_param_byte_count;
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89 printf_params[pi] = (u_long) bp[0] |
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90 (u_long) bp[1] << 8 |
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91 (u_long) bp[2] << 16 |
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92 (u_long) bp[3] << 24;
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93 bp += 4;
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parents:
diff changeset
94 continue;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
95 case 's':
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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96 printf_params[pi] = (u_long) bp;
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97 for (;;) {
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98 if (bp >= endp) {
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99 fprintf(stderr,
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Mychaela Falconia <falcon@freecalypso.org>
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100 "%s line %d: unterminated string parameter in compressed trace\n",
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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101 filename_for_errs,
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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102 lineno_for_errs);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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103 exit(1);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
104 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
105 if (!*bp++)
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
106 break;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
107 }
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
108 continue;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
109 default:
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
110 fprintf(stderr,
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
111 "%s entry #%d: parameter type \'%c\' not supported\n",
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
112 str2ind_tab_filename, cindex, type);
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
113 exit(1);
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
114 }
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
115 }
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
116 if (bp != endp)
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
117 goto wrong_param_byte_count;
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
118 }
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
119
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
120 process_ctrace_line(line, cindex_offset, filename_for_errs, lineno_for_errs)
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
121 char *line, *filename_for_errs;
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
122 {
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
123 if (decode_idx_and_params(line + cindex_offset) < 0) {
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
124 fprintf(stderr,
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
125 "%s line %d: unable to decode compressed trace line\n",
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
126 filename_for_errs, lineno_for_errs);
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
127 exit(1);
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
128 }
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
129 if (cindex >= str2ind_array_size) {
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
130 fprintf(stderr,
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
131 "%s line %d: index %d exceeds the range of %s\n",
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
132 filename_for_errs, lineno_for_errs, cindex,
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
133 str2ind_tab_filename);
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
134 exit(1);
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
135 }
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
136 format_string = str2ind_orig_strings[cindex];
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
137 param_type_string = str2ind_param_strings[cindex];
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
138 num_printf_params = strlen(param_type_string);
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
139 if (num_printf_params > MAX_PRINTF_PARAMS) {
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
140 fprintf(stderr,
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
141 "error: entry #%d in %s has too many parameters\n",
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
142 cindex, str2ind_tab_filename);
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
143 exit(1);
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
144 }
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
145 decode_parameters(filename_for_errs, lineno_for_errs);
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
146 ind2str_doprnt(format_string, printf_params, output_buf);
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
147 printf("%.*s \"%s\"\n", cindex_offset + cindex_nchars, line,
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
148 output_buf);
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
149 return(0);
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
150 }