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annotate cdbget.c @ 16:70f4df5a7283

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add cdb_write, log basic mmap outcomes
author Henry S. Thompson <ht@inf.ed.ac.uk>
date Thu, 27 Feb 2025 18:26:29 +0000
parents 4cc3224ebf41
children
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1 #include "exit.h"
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2 #include "scan.h"
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3 #include "str.h"
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4 #include "buffer.h"
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5 #include "strerr.h"
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6 #include "cdb.h"
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7 #include <stdlib.h>
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8
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9 #define FATAL "cdbget: fatal: "
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11 void die_read(void)
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12 {
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13 strerr_die2sys(111,FATAL,"unable to read input: ");
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14 }
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15 void die_write(void)
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16 {
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17 strerr_die2sys(111,FATAL,"unable to write output: ");
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18 }
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19 void die_usage(void)
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20 {
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21 strerr_die1x(111,"cdbget: usage: cdbget key [skip]");
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22 }
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23
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24 static struct cdb c;
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25 char buf[1024];
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26
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27 int main(int argc,char **argv)
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28 {
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29 char *key;
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30 int r;
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31 uint32 pos;
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32 uint32 len;
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33 unsigned long u = 0;
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34
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35 if (!*argv) die_usage();
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36
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37 if (!*++argv) die_usage();
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38 key = *argv;
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39
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40 if (*++argv) {
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41 scan_ulong(*argv,&u);
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42 }
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43
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44 cdb_init(&c,0);
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45 cdb_findstart(&c);
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46
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47 for (;;) {
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48 r = cdb_findnext(&c,key,str_len(key));
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49 if (r == -1) die_read();
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50 if (!r) exit(100);
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51 if (!u) break;
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52 --u;
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53 }
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54
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4cc3224ebf41 use cdb_write
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55 cdb_write(&c,1);
4cc3224ebf41 use cdb_write
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56 /* pos = cdb_datapos(&c); */
4cc3224ebf41 use cdb_write
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57 /* len = cdb_datalen(&c); */
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58
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59 /* while (len > 0) { */
4cc3224ebf41 use cdb_write
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60 /* r = sizeof buf; */
4cc3224ebf41 use cdb_write
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61 /* if (r > len) r = len; */
4cc3224ebf41 use cdb_write
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62 /* if (cdb_read(&c,buf,r,pos) == -1) die_read(); */
4cc3224ebf41 use cdb_write
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63 /* if (buffer_put(buffer_1small,buf,r) == -1) die_write(); */
4cc3224ebf41 use cdb_write
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64 /* pos += r; */
4cc3224ebf41 use cdb_write
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65 /* len -= r; */
4cc3224ebf41 use cdb_write
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66 /* } */
4cc3224ebf41 use cdb_write
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67 /* if (buffer_flush(buffer_1small) == -1) die_write(); */
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68 exit(0);
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69 }
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