351 lines
6.9 KiB
C
Executable File
351 lines
6.9 KiB
C
Executable File
/*
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* Asterisk -- A telephony toolkit for Linux.
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*
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* A simple program version comparison tool.
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*
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* Copyright (C) 2005, Steven Michael Murphy (murf at e-tools dot com).
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License
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*/
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/* vercomp.c
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args: <program> <comparison> <version>
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where:
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program = path to program (bison or flex)
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comparison = ">", "<", "<=", ">=", "=" -- depending on shell, you may have to use backslash escapes
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version = a version compare against, say 1.875, or 2.5.4, or whatever.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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char *program_version[5];
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char *arg_version[5];
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void get_program_version_string(char *command, char *output)
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{
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char cbuf[8000];
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char pbuf[8000];
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char zbuf[8000];
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char *res;
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FILE *p1;
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zbuf[0] = 0;
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sprintf( cbuf, "%s --version", command );
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p1 = popen(cbuf, "r");
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if( !p1 )
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{
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fprintf(stderr,"vercomp: Could not execute the command: %s\n", command);
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exit(125);
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}
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/* the first line is the magic one */
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res = fgets(zbuf, 8000, p1);
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/* clear the trailing blank */
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if( zbuf[strlen(zbuf)-1] == '\n' )
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zbuf[strlen(zbuf)-1] = 0;
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/* the rest is cruft, just empty the input stream */
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while( res )
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{
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res = fgets(pbuf, 8000, p1);
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}
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/* close the stream. Hopefully, we have what we need */
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pclose(p1);
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/* all we want is the last "word"-- so find the last blank, and grab everything after that */
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res = strrchr(zbuf,' ');
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if( !res )
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{
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fprintf(stderr,"Something is wrong with the version string: %s\n", zbuf);
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exit(124);
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}
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strcpy(output,res+1);
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}
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void extract_version(char *ver_string, char **where)
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{
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int i=0;
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char *p=ver_string;
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while( p && *p )
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{
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where[i++] = p;
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p = strchr(p,'.');
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if( p )
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{
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*p= 0;
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p++;
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}
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}
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}
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void compare_versions(char *compare_func)
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{
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int i;
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for(i=0;i<5;i++)
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{
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/* start out at the beginning, then go to the end */
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if( program_version[i] && arg_version[i] && *program_version[i] && *arg_version[i] )
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{
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if( strlen(program_version[i]) == strspn(program_version[i],"0123456789")
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&& strlen(arg_version[i]) == strspn(arg_version[i],"0123456789") )
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{
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/* just pure numbers -- do a numeric compare */
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int pv = atoi(program_version[i]);
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int av = atoi(arg_version[i]);
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if( pv < av )
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{
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if( !strcmp(compare_func,"=") )
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{
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printf("false\n");
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exit(0);
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}
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else if( !strcmp(compare_func, ">") )
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{
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printf("false\n");
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exit(0);
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}
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else if( !strcmp(compare_func, "<") )
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{
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printf("true\n");
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exit(0);
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}
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else if( !strcmp(compare_func, ">=") )
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{
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printf("false\n");
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exit(0);
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}
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else if( !strcmp(compare_func, "<=") )
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{
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printf("true\n");
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exit(0);
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}
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}
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else if( pv > av )
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{
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if( !strcmp(compare_func,"=") )
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{
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printf("false\n");
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exit(0);
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}
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else if( !strcmp(compare_func, ">") )
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{
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printf("true\n");
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exit(0);
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}
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else if( !strcmp(compare_func, "<") )
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{
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printf("false\n");
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exit(0);
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}
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else if( !strcmp(compare_func, ">=") )
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{
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printf("true\n");
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exit(0);
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}
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else if( !strcmp(compare_func, "<=") )
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{
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printf("false\n");
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exit(0);
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}
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}
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}
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else
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{
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/* other junk thrown in -- do string compare */
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int res = strcmp(program_version[i], arg_version[i]);
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if( res < 0 ) /* prog is less than arg */
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{
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if( !strcmp(compare_func,"=") )
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{
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printf("false\n");
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exit(0);
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}
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else if( !strcmp(compare_func, ">") )
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{
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printf("false\n");
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exit(0);
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}
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else if( !strcmp(compare_func, "<") )
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{
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printf("true\n");
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exit(0);
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}
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else if( !strcmp(compare_func, ">=") )
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{
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printf("false\n");
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exit(0);
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}
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else if( !strcmp(compare_func, "<=") )
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{
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printf("true\n");
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exit(0);
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}
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}
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else if( res > 0 ) /* prog is greater than arg */
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{
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if( !strcmp(compare_func,"=") )
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{
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printf("false\n");
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exit(0);
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}
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else if( !strcmp(compare_func, ">") )
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{
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printf("true\n");
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exit(0);
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}
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else if( !strcmp(compare_func, "<") )
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{
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printf("false\n");
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exit(0);
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}
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else if( !strcmp(compare_func, ">=") )
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{
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printf("true\n");
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exit(0);
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}
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else if( !strcmp(compare_func, "<=") )
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{
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printf("false\n");
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exit(0);
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}
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}
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}
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}
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else if( program_version[i] && *program_version[i] )
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{
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if( !strcmp(compare_func,"=") )
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{
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printf("false\n");
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exit(0);
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}
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else if( !strcmp(compare_func, ">") )
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{
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printf("true\n");
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exit(0);
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}
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else if( !strcmp(compare_func, "<") )
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{
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printf("false\n");
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exit(0);
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}
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else if( !strcmp(compare_func, ">=") )
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{
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printf("true\n");
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exit(0);
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}
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else if( !strcmp(compare_func, "<=") )
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{
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printf("false\n");
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exit(0);
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}
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}
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else if( arg_version[i] && *arg_version[i] )
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{
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if( !strcmp(compare_func,"=") )
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{
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printf("false\n");
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exit(0);
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}
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else if( !strcmp(compare_func, ">") )
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{
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printf("false\n");
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exit(0);
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}
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else if( !strcmp(compare_func, "<") )
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{
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printf("true\n");
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exit(0);
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}
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else if( !strcmp(compare_func, ">=") )
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{
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printf("false\n");
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exit(0);
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}
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else if( !strcmp(compare_func, "<=") )
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{
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printf("true\n");
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exit(0);
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}
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}
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else
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break;
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}
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if( !strcmp(compare_func,"=") )
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{
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printf("true\n");
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exit(0);
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}
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else if( !strcmp(compare_func, ">") )
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{
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printf("false\n");
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exit(0);
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}
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else if( !strcmp(compare_func, "<") )
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{
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printf("false\n");
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exit(0);
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}
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else if( !strcmp(compare_func, ">=") )
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{
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printf("true\n");
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exit(0);
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}
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else if( !strcmp(compare_func, "<=") )
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{
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printf("true\n");
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exit(0);
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}
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}
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void usage(void)
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{
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printf("Usage: <program-path> <comparison> <version>\n\
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\n\
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where:\n\
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\n\
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program-path = path to program (bison or flex)\n\
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comparison = '>', '<', '<=', '>=', '=' -- depending on shell, you may have to use backslash escapes\n\
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version = a version compare against, say 1.875, or 2.5.4, or whatever.\n\n");
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}
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int main(int argc, char **argv)
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{
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char program_version_string[8000];
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/* before starting, check args and make sure all is OK */
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if( argc < 4 || argc > 4 )
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{
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usage();
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exit(-256);
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}
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if ( strcmp(argv[2],"=") && strcmp(argv[2],">") && strcmp(argv[2],"<") && strcmp(argv[2],">=") && strcmp(argv[2],"<=") )
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{
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fprintf(stderr,"vercomp: ILLEGAL input Comparison value: %s\n\n", argv[2]);
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usage();
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exit(-256);
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}
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/* first, extract a version from the command line arg */
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extract_version(argv[3], arg_version);
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/* next, extract a version from the command line */
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get_program_version_string(argv[1], program_version_string);
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extract_version(program_version_string, program_version);
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/* next compare and return result */
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compare_versions(argv[2]);
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/* the above func shouldn't return */
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}
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