92 lines
1.9 KiB
C++
92 lines
1.9 KiB
C++
#ifndef __DPKDEPS_H__
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#define __DPKDEPS_H__
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#include <locale>
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#include "string/string.h"
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// Comparaison function for version numbers
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// Implementation is based on dpkg's version comparison code (verrevcmp() and order())
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// http://anonscm.debian.org/gitweb/?p=dpkg/dpkg.git;a=blob;f=lib/dpkg/version.c;hb=74946af470550a3295e00cf57eca1747215b9311
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inline int char_weight(char c){
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if (std::isdigit(c))
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return 0;
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else if (std::isalpha(c))
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return c;
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else if (c == '~')
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return -1;
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else if (c)
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return c + 256;
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else
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return 0;
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}
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inline int DpkPakVersionCmp(const char* a, const char* b){
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while (*a || *b) {
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int firstDiff = 0;
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while ((*a && !std::isdigit(*a)) || (*b && !std::isdigit(*b))) {
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int ac = char_weight(*a);
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int bc = char_weight(*b);
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if (ac != bc)
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return ac - bc;
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a++;
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b++;
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}
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while (*a == '0')
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a++;
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while (*b == '0')
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b++;
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while (std::isdigit(*a) && std::isdigit(*b)) {
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if (firstDiff == 0)
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firstDiff = *a - *b;
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a++;
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b++;
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}
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if (std::isdigit(*a))
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return 1;
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if (std::isdigit(*b))
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return -1;
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if (firstDiff)
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return firstDiff;
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}
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return false;
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}
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// release strings after using
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inline bool DpkReadDepsLine( const char *line, char **pakname, char **pakversion ){
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const char* c = line;
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const char* p_name;
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const char* p_name_end;
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const char* p_version;
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const char* p_version_end;
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*pakname = 0;
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*pakversion = 0;
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while ( std::isspace( *c ) && *c != '\0' ) ++c;
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p_name = c;
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while ( !std::isspace( *c ) && *c != '\0' ) ++c;
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p_name_end = c;
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while ( std::isspace( *c ) && *c != '\0' ) ++c;
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p_version = c;
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while ( !std::isspace( *c ) && *c != '\0' ) ++c;
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p_version_end = c;
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if ( p_name_end - p_name > 0 ) {
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*pakname = string_clone_range( StringRange( p_name, p_name_end ) );
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} else return false;
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if ( p_version_end - p_version > 0 ) {
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*pakversion = string_clone_range( StringRange( p_version, p_version_end ) );
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}
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return true;
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}
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#endif
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