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utilskel.c
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C/C++ Source or Header
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1992-05-06
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5KB
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127 lines
/*
** The following is a suggested skeleton for utilities which expect
** to handle a variable number of files with wildcards handled in
** input files and redirection of output files. This type of application
** is very common and is difficult to handle...thus this example.
**
** The command line syntax for the resulting program is:
** **name** [-o outputpath] file file file...
** where the -o parameter is optional and indicates the path to
** the directory where output files are to be placed.
**
** The skeleton handles wild card file names in the following fashion:
** First, if a "-o" option is detected, the skeleton builds an output
** file name mask consisting of the path given by the user after the
** option. Then it reads file names from the command line and uses
** the "wildexp" function to expand them into a table of existing
** filenames which match. For each filename in the table, the skeleton
** opens a file. If a "-o" option was given by the user, it concatenates
** the input filename to the path obtained above, otherwise it
** concatenates ".f" to the end of the input filename. These actions
** are necessary to ensure that the input file and the output file
** have different names. The skeleton then opens the output file
** and calls "dowork". If there are errors in opening either the
** input file or the output file, "dowork" is not called and an
** appropriate message is printed to stderr.
**
** Basically, to use this skeleton, first replace occurances of "**name**"
** with the name of the utility you are creating. Then, write the
** "dowork" function. The "dowork" function gets two arguments..."fin"
** and "fout". For each file the user wants to process, the "main"
** function opens an input file (fin) and an output file (fout) and
** then calls "dowork"...which performs whatever processing there is
** to be done and then returns.
**
** Written by: Rick Schaeffer
** E. 13611 26th Ave.
** Spokane, Wa. 99216
** Compuserve ID: 70120,174
** Bytenet ID: ricks.
*/
#include <stdio.h>
extern int Enable_Abort;
char *largv[128];
main(argc,argv)
int argc;
char *argv[];
{
char outpath[80];
char outname[80];
char *nameonly,*strrchr();
char *malloc();
int i,j,begarg;
FILE *fin,*fout;
Enable_Abort = 1;
outpath[0] = 0;
if ((argc < 2) || (strcmp(argv[1],"?") == 0)) {
printf("**name** -- Usage:\n");
printf(" **name** [-o outpath] file file\n\n");
printf("if -o option present, will write files to that path\n");
printf("Otherwise concatenates '.f' to input file names\n\n");
exit(1);
}
if (strcmp(argv[1],"-o") == 0) {
strncpy(outpath,argv[2],78);
begarg = 3;
}
else
begarg = 1;
for (i=begarg; i<argc; i++) {
if (iswild(argv[i])) {
wildexp(argv[i],largv,127);
if (largv[0] == NULL)
fprintf(stderr,"No matching files for ==> %s!\n",argv[i]);
}
else {
largv[0] = malloc(strlen(argv[i])+1);
strcpy(largv[0],argv[i]);
largv[1] = NULL;
}
j=0;
while (largv[j] != NULL) {
if (outpath[0] == 0) {
strncpy(outname,largv[j],77);
strcat(outname,".f");
}
else {
strcpy(outname,outpath);
nameonly = strrchr(largv[j],'/');
if (nameonly == NULL)
nameonly = strrchr(largv[j],':');
if (nameonly == NULL)
nameonly = largv[j];
else
nameonly++;
if ((strlen(outname) + strlen(nameonly)) > 79) {
fprintf(stderr,"Pathname+Filename too long\n");
break;
}
strcat(outname,nameonly);
}
if ((fin = fopen(largv[j],"r")) == NULL) {
fprintf(stderr,"Couldn't open input file ==> %s\n",largv[j]);
break;
}
if ((fout = fopen(outname,"w")) == NULL) {
fprintf(stderr,"Couldn't open output file ==> %s\n",outname);
fclose(fin);
break;
}
fprintf(stderr,"%s ==> %s\n",largv[j],outname);
dowork(fin,fout);
fclose(fin);
fclose(fout);
j++;
}
}
}
dowork(*fin,*fout)
FILE *fin,*fout;
{
}