gno/usr.bin/sort/msort.c

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1996-01-28 00:52:48 +00:00
#ifdef __CCFRONT__
#include <14:pragma.h>
#endif
/*
* msort -- sort a text file in memory lexicographically
*
* Synopsis:
* msort [-hvV?] [-o outfile] [-n lines] file1 [file2 ...]
*
* Options:
* -h -? -- print version and usage info, then exit
* -n <lines> -- don't try to sort files over <lines> lines long
* -o <outfile> -- sorted output to <outfile> rather than
* to stdout
* -v -- verbose operation
* -V -- print version information
*/
#define DEFFUNC
#define MSORT
#include "common.h"
#include <limits.h>
#include <stdlib.h>
#include <errno.h>
#include "/usr/include/getopt.h" /* GNU version */
extern int optind;
extern char *optarg;
extern int errno;
static char *versionstring="\
Version 1.0 by Devin Reade\n";
static char *usagestring="\
msort -- Sort a text file in memory lexicographically\n\
\n\
Synopsis:\n\
\tmsort [-hvV?] [-o outfile] file1 [file2 ...]\n\
\n\
Options:\n\
\t-h -?\t\t-- Print version and usage info, then exit.\n\
\t-n <m>\t\t-- Set the maximum number of lines per file to <m>.\n\
\t-o <outfile>\t-- Dump sorted output to <outfile> rather\n\
\t\t\t than to stdout.\n\
\t-v\t\t-- Verbose operation.\n\
\t-V\t\t-- Print version information.\n";
int main (int argc, char **argv) {
size_t lc, i;
char *outfile; /* the name of the output file, if nec */
char **array; /* an array of strings; for sorting */
size_t maxlinelen; /* length of longest line in current file */
size_t maxlinecount; /* max number of lines we want to allow */
short failed=0; /* any errors found? */
int c;
short errflag=0;
short n_flag=0;
short o_flag=0;
short V_flag=0;
/* v_flag defined in common.h */
#ifdef DEBUG
begin_stack_check();
#endif
/*
* parse the command line
*/
while ((c= getopt(argc,argv,"hn:o:vV?")) != EOF)
switch (c) {
case 'n': /* don't try to sort if file is over n lines long */
n_flag++;
errno = 0;
maxlinecount = (size_t) atol(optarg);
if (errno == ERANGE) maxlinecount = DEFAULT_LINECOUNT;
break;
case 'o': /* redirect sorted output to file */
o_flag++;
outfile = optarg;
break;
case 'v': /* verbose */
v_flag++;
break;
case 'V': /* print version information */
V_flag++;
break;
case '?': /* fallthrough */
case 'h': /* fallthrough */
default: /* Display usage, version, and exit */
V_flag++;
errflag++;
break;
}
/*
* React to command line parameters
*/
if (errflag) {
fprintf(stderr,"\n%s\n%s\n",usagestring,versionstring);
return -1;
}
if (V_flag) fprintf(stderr,"\n%s\n",versionstring);
if (!n_flag) maxlinecount = DEFAULT_LINECOUNT;
if (v_flag) fprintf(stderr,"Maximum lines per file = %lu\n",maxlinecount);
if (o_flag) {
if ((out_fp = fopen(outfile,"w")) == NULL) {
if (v_flag) perror("open on output file failed");
return -1;
}
} else out_fp = stdout;
/* loop through files */
for (; optind<argc; optind++) {
/* get the line count */
lc = linecount(argv[optind], &maxlinelen);
if (lc>maxlinecount) {
if (v_flag)
fprintf(stderr,"%s too long for an in-memory sort -- file skipped\n",
argv[optind]);
failed = 1;
continue;
}
/* load the array */
array = loadarray (lc, argv[optind], maxlinelen);
if (array == NULL) {
if (v_flag) fprintf(stderr,"Ignoring file %s\n",argv[optind]);
failed = 1;
continue;
}
/* sort it */
sortarray (array,lc);
/* print the sorted file out and clean up the array */
for (i=0; i<lc; i++) {
fprintf(out_fp,"%s",array[i]);
free(array[i]);
}
free(array);
}
#ifdef DEBUG
fprintf(stderr,"%s stack usage: %d bytes\n",argv[0],end_stack_check());
#endif
if (failed) return -1;
else return 0;
}