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annotate buffer_put.c @ 13:0a35d8de4296

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author Henry S. Thompson <ht@inf.ed.ac.uk>
date Fri, 07 Feb 2025 14:43:27 +0000
parents 3bfef1f22a97
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
0
2cb46628feec from cdb-0.75 per http://cr.yp.to/cdb.html,
Henry S. Thompson <ht@inf.ed.ac.uk>
parents:
diff changeset
1 #include "buffer.h"
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2 #include "str.h"
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3 #include "byte.h"
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4 #include "error.h"
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5
10
3bfef1f22a97 trivial changes to get rid of compile-time warnings
Henry S. Thompson <ht@inf.ed.ac.uk>
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6 static int allwrite(ssize_t (*op)(),int fd,char *buf,unsigned int len)
0
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7 {
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8 int w;
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9
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10 while (len) {
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11 w = op(fd,buf,len);
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12 if (w == -1) {
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13 if (errno == error_intr) continue;
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14 return -1; /* note that some data may have been written */
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15 }
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16 if (w == 0) ; /* luser's fault */
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17 buf += w;
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18 len -= w;
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19 }
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20 return 0;
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21 }
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22
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23 int buffer_flush(buffer *s)
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24 {
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25 int p;
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26
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27 p = s->p;
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28 if (!p) return 0;
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29 s->p = 0;
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30 return allwrite(s->op,s->fd,s->x,p);
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31 }
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32
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33 int buffer_putalign(buffer *s,char *buf,unsigned int len)
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34 {
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35 unsigned int n;
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36
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37 while (len > (n = s->n - s->p)) {
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38 byte_copy(s->x + s->p,n,buf); s->p += n; buf += n; len -= n;
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39 if (buffer_flush(s) == -1) return -1;
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40 }
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41 /* now len <= s->n - s->p */
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42 byte_copy(s->x + s->p,len,buf);
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43 s->p += len;
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44 return 0;
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45 }
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46
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47 int buffer_put(buffer *s,char *buf,unsigned int len)
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48 {
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49 unsigned int n;
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50
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51 n = s->n;
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52 if (len > n - s->p) {
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53 if (buffer_flush(s) == -1) return -1;
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54 /* now s->p == 0 */
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55 if (n < BUFFER_OUTSIZE) n = BUFFER_OUTSIZE;
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56 while (len > s->n) {
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57 if (n > len) n = len;
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58 if (allwrite(s->op,s->fd,buf,n) == -1) return -1;
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59 buf += n;
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60 len -= n;
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61 }
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62 }
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63 /* now len <= s->n - s->p */
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64 byte_copy(s->x + s->p,len,buf);
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65 s->p += len;
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66 return 0;
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67 }
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68
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69 int buffer_putflush(buffer *s,char *buf,unsigned int len)
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70 {
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71 if (buffer_flush(s) == -1) return -1;
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72 return allwrite(s->op,s->fd,buf,len);
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73 }
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74
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75 int buffer_putsalign(buffer *s,char *buf)
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76 {
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77 return buffer_putalign(s,buf,str_len(buf));
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78 }
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79
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80 int buffer_puts(buffer *s,char *buf)
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81 {
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82 return buffer_put(s,buf,str_len(buf));
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83 }
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84
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85 int buffer_putsflush(buffer *s,char *buf)
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86 {
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87 return buffer_putflush(s,buf,str_len(buf));
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88 }