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