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annotate libutil/dbread.c @ 27:ca8a6f95826a

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implemented sws-card-lookup and underlying libutil functions
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 16 Mar 2021 23:22:37 +0000
parents
children fa81221ac9b6
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rev   line source
27
ca8a6f95826a implemented sws-card-lookup and underlying libutil functions
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1 /*
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2 * This module implements functions for reading key=value database files.
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3 */
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4
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5 #include <ctype.h>
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6 #include <stdio.h>
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7 #include <stdlib.h>
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8 #include <string.h>
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9 #include <strings.h>
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10 #include "dbread.h"
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11
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12 static
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13 parse_read_line(dbs, filename_for_errs, lineno_for_errs)
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14 struct dbread_state *dbs;
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15 char *filename_for_errs;
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16 int lineno_for_errs;
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17 {
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18 unsigned n;
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19 char *cp, *np;
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20
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21 n = 0;
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22 for (cp = dbs->linebuf; ; ) {
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23 while (isspace(*cp))
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24 cp++;
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25 if (!*cp)
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26 break;
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27 if (*cp == '=') {
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28 inv_syntax: fprintf(stderr, "%s line %d: invalid syntax\n",
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29 filename_for_errs, lineno_for_errs);
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30 return(-1);
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31 }
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32 for (np = cp; ; cp++) {
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33 if (*cp == '=')
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34 break;
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35 if (!*cp || isspace(*cp))
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36 goto inv_syntax;
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37 }
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38 *cp++ = '\0';
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39 if (n >= DBREAD_MAX_KV_PAIRS) {
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40 fprintf(stderr,
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41 "%s line %d: too many key=value pairs\n",
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42 filename_for_errs, lineno_for_errs);
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43 return(-1);
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44 }
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45 dbs->kv_pairs[n].key = np;
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46 dbs->kv_pairs[n].value = cp;
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47 n++;
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48 while (*cp && !isspace(*cp))
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49 cp++;
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50 if (*cp)
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51 *cp++ = '\0';
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52 }
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53 dbs->num_kv_pairs = n;
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54 return(0);
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55 }
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56
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57 char *
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58 dbread_find_key(dbs, sought_key)
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59 struct dbread_state *dbs;
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60 char *sought_key;
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61 {
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62 unsigned n;
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63
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64 for (n = 0; n < dbs->num_kv_pairs; n++)
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65 if (!strcasecmp(dbs->kv_pairs[n].key, sought_key))
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66 return dbs->kv_pairs[n].value;
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67 return 0;
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68 }
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69
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70 dbread_find_record(filename, dbs, sought_key, sought_value)
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71 char *filename, *sought_key, *sought_value;
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72 struct dbread_state *dbs;
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73 {
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74 FILE *inf;
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75 int lineno;
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76 char *cp;
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77
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78 inf = fopen(filename, "r");
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79 if (!inf) {
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80 perror(filename);
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81 return(-1);
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82 }
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83 for (lineno = 1; fgets(dbs->linebuf, DBREAD_LINEBUF_SIZE, inf);
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84 lineno++) {
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85 if (!index(dbs->linebuf, '\n')) {
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86 fprintf(stderr,
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87 "%s line %d: too long or missing newline\n",
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88 filename, lineno);
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89 fclose(inf);
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90 return(-1);
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91 }
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92 if (parse_read_line(dbs, filename, lineno) < 0) {
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93 /* error msg already printed */
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94 fclose(inf);
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95 return(-1);
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96 }
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97 cp = dbread_find_key(dbs, sought_key);
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98 if (!cp)
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99 continue;
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100 if (strcmp(cp, sought_value))
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101 continue;
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102 /* found our record: struct dbread_state is our return */
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103 fclose(inf);
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104 return(0);
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105 }
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106 fclose(inf);
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107 fprintf(stderr, "error: %s=%s not found in %s\n", sought_key,
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108 sought_value, filename);
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109 return(-1);
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110 }