/* * rpmvercmp.c * * Copyright (c) 2002-2006 by Judd Vinet * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, * USA. */ #include #include #include #include "config.h" #include "rpmvercmp.h" /* this function was taken from rpm 4.0.4 and rewritten */ int rpmvercmp(const char *a, const char *b) { char *str1, *str2; char *one, *two; char *rel1 = NULL, *rel2 = NULL; char oldch1, oldch2; int is1num, is2num; int rc; if(!strcmp(a,b)) { return(0); } str1 = strdup(a); str2 = strdup(b); /* lose the release number */ for(one = str1; *one && *one != '-'; one++); if(one) { *one = '\0'; rel1 = ++one; } for(two = str2; *two && *two != '-'; two++); if(two) { *two = '\0'; rel2 = ++two; } one = str1; two = str2; while(*one || *two) { while(*one && !isalnum(*one)) one++; while(*two && !isalnum(*two)) two++; str1 = one; str2 = two; /* find the next segment for each string */ if(isdigit(*str1)) { is1num = 1; while(*str1 && isdigit(*str1)) str1++; } else { is1num = 0; while(*str1 && isalpha(*str1)) str1++; } if(isdigit(*str2)) { is2num = 1; while(*str2 && isdigit(*str2)) str2++; } else { is2num = 0; while(*str2 && isalpha(*str2)) str2++; } oldch1 = *str1; *str1 = '\0'; oldch2 = *str2; *str2 = '\0'; /* see if we ran out of segments on one string */ if(one == str1 && two != str2) { return(is2num ? -1 : 1); } if(one != str1 && two == str2) { return(is1num ? 1 : -1); } /* see if we have a type mismatch (ie, one is alpha and one is digits) */ if(is1num && !is2num) return(1); if(!is1num && is2num) return(-1); if(is1num) while(*one == '0') one++; if(is2num) while(*two == '0') two++; rc = strverscmp(one, two); if(rc) return(rc); *str1 = oldch1; *str2 = oldch2; one = str1; two = str2; } if((!*one) && (!*two)) { /* compare release numbers */ if(rel1 && rel2) return(rpmvercmp(rel1, rel2)); return(0); } return(*one ? 1 : -1); } #ifndef HAVE_STRVERSCMP /* GNU's strverscmp() function, taken from glibc 2.3.2 sources */ /* Compare strings while treating digits characters numerically. Copyright (C) 1997, 2002 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Jean-François Bignolles , 1997. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ /* states: S_N: normal, S_I: comparing integral part, S_F: comparing fractionnal parts, S_Z: idem but with leading Zeroes only */ #define S_N 0x0 #define S_I 0x4 #define S_F 0x8 #define S_Z 0xC /* result_type: CMP: return diff; LEN: compare using len_diff/diff */ #define CMP 2 #define LEN 3 /* Compare S1 and S2 as strings holding indices/version numbers, returning less than, equal to or greater than zero if S1 is less than, equal to or greater than S2 (for more info, see the texinfo doc). */ int strverscmp (s1, s2) const char *s1; const char *s2; { const unsigned char *p1 = (const unsigned char *) s1; const unsigned char *p2 = (const unsigned char *) s2; unsigned char c1, c2; int state; int diff; /* Symbol(s) 0 [1-9] others (padding) Transition (10) 0 (01) d (00) x (11) - */ static const unsigned int next_state[] = { /* state x d 0 - */ /* S_N */ S_N, S_I, S_Z, S_N, /* S_I */ S_N, S_I, S_I, S_I, /* S_F */ S_N, S_F, S_F, S_F, /* S_Z */ S_N, S_F, S_Z, S_Z }; static const int result_type[] = { /* state x/x x/d x/0 x/- d/x d/d d/0 d/- 0/x 0/d 0/0 0/- -/x -/d -/0 -/- */ /* S_N */ CMP, CMP, CMP, CMP, CMP, LEN, CMP, CMP, CMP, CMP, CMP, CMP, CMP, CMP, CMP, CMP, /* S_I */ CMP, -1, -1, CMP, +1, LEN, LEN, CMP, +1, LEN, LEN, CMP, CMP, CMP, CMP, CMP, /* S_F */ CMP, CMP, CMP, CMP, CMP, LEN, CMP, CMP, CMP, CMP, CMP, CMP, CMP, CMP, CMP, CMP, /* S_Z */ CMP, +1, +1, CMP, -1, CMP, CMP, CMP, -1, CMP, CMP, CMP }; if (p1 == p2) return 0; c1 = *p1++; c2 = *p2++; /* Hint: '0' is a digit too. */ state = S_N | ((c1 == '0') + (isdigit (c1) != 0)); while ((diff = c1 - c2) == 0 && c1 != '\0') { state = next_state[state]; c1 = *p1++; c2 = *p2++; state |= (c1 == '0') + (isdigit (c1) != 0); } state = result_type[state << 2 | (((c2 == '0') + (isdigit (c2) != 0)))]; switch (state) { case CMP: return diff; case LEN: while (isdigit (*p1++)) if (!isdigit (*p2++)) return 1; return isdigit (*p2) ? -1 : diff; default: return state; } } #endif /* vim: set ts=2 sw=2 noet: */