Mercurial > noffle

annotate src/dynamicstring.c @ 165:8ea6b5ddc5a5 noffle

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[svn] * src/lock.h,src/lock.c,src/noffle.c: Add lazy lock release. Only release the lock and close the databases if (a) another process signals us SIGUSR1 indicating it wants the lock, or (b) it is explicitly requested by a call to new function Lock_syncDatabases(). When waiting for the lock, SIGUSR1 the holding process every second. This is all an attempt to minimise the number of times we need to close and open the database. When (ha!) the database is replaced by something that can handle multiple simultaneous writers (with appropriate locking) this won't be necessary.
author bears
date Thu, 25 Jan 2001 13:38:31 +0000
parents e612b263934f
children 24d4cd032da5
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
43
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1 /*
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2 dynamicstring.c
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3
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4 $Id: dynamicstring.c 65 2000-05-12 16:52:41Z enz $
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5 */
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6
45
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7 #if HAVE_CONFIG_H
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8 #include <config.h>
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9 #endif
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10
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11 #include "dynamicstring.h"
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12
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13 #include <sys/types.h>
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14 #include "log.h"
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125d79c9e586 [svn] * src/client.c, src/configfile.c, src/content.c, src/control.c,
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15 #include "portable.h"
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16
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17 struct DynStr
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18 {
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19 int len; /* Current length (without trailing '\0') */
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20 int max; /* Max length that fits into buffer (incl. trailing '\0') */
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21 char *str;
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22 };
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23
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24 static void
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25 reallocStr( DynStr *self, int max )
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26 {
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27 ASSERT( max >= 0 );
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28 if ( max <= self->max )
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29 return;
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30 if ( ! ( self->str = (char *)realloc( self->str, (size_t)max ) ) )
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31 {
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32 Log_err( "Realloc of DynStr failed" );
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33 exit( EXIT_FAILURE );
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34 }
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35 if ( self->max == 0 ) /* First allocation? */
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36 *(self->str) = '\0';
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37 self->max = max;
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38 }
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39
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40 DynStr *
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41 new_DynStr( int reserve )
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42 {
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43 DynStr *s;
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44
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45 if ( ! ( s = malloc( sizeof( DynStr ) ) ) )
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46 {
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47 Log_err( "Allocation of DynStr failed" );
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48 exit( EXIT_FAILURE );
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49 }
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50 s->len = 0;
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51 s->max = 0;
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52 s->str = NULL;
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53 if ( reserve > 0 )
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54 reallocStr( s, reserve + 1 );
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55 return s;
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56 }
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57
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58 void
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59 del_DynStr( DynStr *self )
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60 {
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61 if ( ! self )
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62 return;
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63 free( self->str );
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64 self->str = NULL;
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65 free( self );
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66 }
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67
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68 int
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69 DynStr_len( const DynStr *self )
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70 {
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71 return self->len;
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72 }
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73
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74 const char *
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75 DynStr_str( const DynStr *self )
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76 {
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77 return self->str;
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78 }
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79
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80 void
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81 DynStr_app( DynStr *self, const char *s )
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82 {
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83 int len;
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84
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85 len = strlen( s );
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86 if ( self->len + len + 1 > self->max )
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87 reallocStr( self, self->len * 2 + len + 1 );
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88 strcpy( self->str + self->len, s );
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89 self->len += len;
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90 }
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91
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92 void
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93 DynStr_appDynStr( DynStr *self, const DynStr *s )
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94 {
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95 if ( self->len + s->len + 1 > self->max )
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96 reallocStr( self, self->len * 2 + s->len + 1 );
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97 memcpy( self->str + self->len, s->str, (size_t)s->len + 1 );
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98 self->len += s->len;
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99 }
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100
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101 void
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102 DynStr_appLn( DynStr *self, const char *s )
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103 {
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104 DynStr_app( self, s );
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105 DynStr_app( self, "\n" );
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106 }
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107
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108 void
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109 DynStr_appN( DynStr *self, const char *s, int n )
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110 {
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111 int len = self->len;
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112
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113 ASSERT( n >= 0 );
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114 if ( len + n + 1 > self->max )
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115 reallocStr( self, len * 2 + n + 1 );
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116 strncat( self->str + len, s, (size_t)n );
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117 self->len = len + strlen( self->str + len );
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118 }
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119
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120 void
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121 DynStr_clear( DynStr *self )
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122 {
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123 self->len = 0;
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124 if ( self->max > 0 )
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125 *(self->str) = '\0';
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126 }
2842f50feb55 [svn] * client.c, client.h, common.h, config.c, config.h, content.c, content.h,
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