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annotate cdbget.c @ 6:fb33dc49cd48

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author Henry S. Thompson <ht@inf.ed.ac.uk>
date Wed, 29 Jan 2025 12:43:39 +0000
parents 2cb46628feec
children 3bfef1f22a97
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0
2cb46628feec from cdb-0.75 per http://cr.yp.to/cdb.html,
Henry S. Thompson <ht@inf.ed.ac.uk>
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diff changeset
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
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8 #define FATAL "cdbget: fatal: "
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9
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10 void die_read(void)
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11 {
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12 strerr_die2sys(111,FATAL,"unable to read input: ");
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13 }
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14 void die_write(void)
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15 {
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16 strerr_die2sys(111,FATAL,"unable to write output: ");
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17 }
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18 void die_usage(void)
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19 {
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20 strerr_die1x(111,"cdbget: usage: cdbget key [skip]");
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21 }
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22
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23 static struct cdb c;
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24 char buf[1024];
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25
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26 main(int argc,char **argv)
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27 {
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28 char *key;
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29 int r;
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30 uint32 pos;
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31 uint32 len;
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32 unsigned long u = 0;
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33
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34 if (!*argv) die_usage();
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35
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36 if (!*++argv) die_usage();
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37 key = *argv;
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38
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39 if (*++argv) {
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40 scan_ulong(*argv,&u);
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41 }
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42
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43 cdb_init(&c,0);
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44 cdb_findstart(&c);
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45
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46 for (;;) {
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47 r = cdb_findnext(&c,key,str_len(key));
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48 if (r == -1) die_read();
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49 if (!r) _exit(100);
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50 if (!u) break;
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51 --u;
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52 }
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53
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54 pos = cdb_datapos(&c);
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55 len = cdb_datalen(&c);
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56
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57 while (len > 0) {
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58 r = sizeof buf;
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59 if (r > len) r = len;
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60 if (cdb_read(&c,buf,r,pos) == -1) die_read();
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61 if (buffer_put(buffer_1small,buf,r) == -1) die_write();
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62 pos += r;
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63 len -= r;
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64 }
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65 if (buffer_flush(buffer_1small) == -1) die_write();
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66 _exit(0);
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67 }