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https://github.com/cc65/cc65.git
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316 lines
8.7 KiB
C
316 lines
8.7 KiB
C
/*****************************************************************************/
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/* */
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/* cmdline.c */
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/* */
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/* Helper functions for command line parsing */
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/* */
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/* */
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/* */
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/* (C) 2000 Ullrich von Bassewitz */
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/* Wacholderweg 14 */
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/* D-70597 Stuttgart */
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/* EMail: uz@musoftware.de */
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/* */
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/* */
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/* This software is provided 'as-is', without any expressed or implied */
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/* warranty. In no event will the authors be held liable for any damages */
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/* arising from the use of this software. */
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/* */
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/* Permission is granted to anyone to use this software for any purpose, */
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/* including commercial applications, and to alter it and redistribute it */
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/* freely, subject to the following restrictions: */
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/* */
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/* 1. The origin of this software must not be misrepresented; you must not */
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/* claim that you wrote the original software. If you use this software */
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/* in a product, an acknowledgment in the product documentation would be */
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/* appreciated but is not required. */
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/* 2. Altered source versions must be plainly marked as such, and must not */
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/* be misrepresented as being the original software. */
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/* 3. This notice may not be removed or altered from any source */
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/* distribution. */
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/* */
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/*****************************************************************************/
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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/* common */
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#include "abend.h"
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#include "chartype.h"
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#include "fname.h"
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#include "xmalloc.h"
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#include "cmdline.h"
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/*****************************************************************************/
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/* Data */
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/*****************************************************************************/
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/* Program name - is set after call to InitCmdLine */
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const char* ProgName;
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/* The program argument vector */
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char** ArgVec = 0;
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unsigned ArgCount = 0;
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/* Struct to pass the command line */
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typedef struct {
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char** Vec; /* The argument vector */
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unsigned Count; /* Actual number of arguments */
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unsigned Size; /* Number of argument allocated */
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} CmdLine;
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/*****************************************************************************/
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/* Helper functions */
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/*****************************************************************************/
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static void NewCmdLine (CmdLine* L)
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/* Initialize a CmdLine struct */
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{
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unsigned I;
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/* Initialize the struct */
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L->Size = 8;
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L->Count = 0;
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L->Vec = xmalloc (L->Size * sizeof (L->Vec[0]));
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/* Copy the arguments. We have to allocate them on free store, otherwise
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* we would have to keep track which one is on free store and which not,
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* which is a lot more overhead.
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*/
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for (I = 0; I < L->Count; ++I) {
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L->Vec[I] = xstrdup (ArgVec[I]);
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}
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}
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static void AddArg (CmdLine* L, char* Arg)
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/* Add one argument to the list */
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{
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if (L->Size <= L->Count) {
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/* No space left, reallocate */
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unsigned NewSize = L->Size * 2;
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char** NewVec = xmalloc (NewSize * sizeof (L->Vec[0]));
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memcpy (NewVec, L->Vec, L->Count * sizeof (L->Vec[0]));
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xfree (L->Vec);
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L->Vec = NewVec;
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L->Size = NewSize;
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}
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/* We have space left, add a copy of the argument */
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L->Vec[L->Count++] = Arg;
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}
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static void ExpandFile (CmdLine* L, const char* Name)
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/* Add the contents of a file to the command line. Each line is a separate
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* argument with leading and trailing whitespace removed.
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*/
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{
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char Buf [256];
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/* Try to open the file for reading */
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FILE* F = fopen (Name, "r");
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if (F == 0) {
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AbEnd ("Cannot open \"%s\": %s", Name, strerror (errno));
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}
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/* File is open, read all lines */
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while (fgets (Buf, sizeof (Buf), F) != 0) {
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/* Get a pointer to the buffer */
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const char* B = Buf;
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/* Skip trailing whitespace (this will also kill the newline that is
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* appended by fgets().
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*/
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unsigned Len = strlen (Buf);
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while (Len > 0 && IsSpace (Buf [Len-1])) {
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--Len;
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}
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Buf [Len] = '\0';
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/* Skip leading spaces */
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while (IsSpace (*B)) {
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++B;
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}
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/* Skip empty lines to work around problems with some editors */
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if (*B == '\0') {
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continue;
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}
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/* Add anything not empty to the command line */
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AddArg (L, xstrdup (B));
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}
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/* Close the file, ignore errors here since we had the file open for
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* reading only.
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*/
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(void) fclose (F);
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}
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/*****************************************************************************/
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/* Code */
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/*****************************************************************************/
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void InitCmdLine (int* aArgCount, char** aArgVec[], const char* aProgName)
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/* Initialize command line parsing. aArgVec is the argument array terminated by
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* a NULL pointer (as usual), ArgCount is the number of valid arguments in the
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* array. Both arguments are remembered in static storage.
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*/
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{
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CmdLine L;
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int I;
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/* Get the program name from argv[0] but strip a path */
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if (*(aArgVec)[0] == 0) {
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/* Use the default name given */
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ProgName = aProgName;
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} else {
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/* Strip a path */
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ProgName = FindName ((*aArgVec)[0]);
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if (ProgName[0] == '\0') {
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/* Use the default */
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ProgName = aProgName;
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}
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}
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/* Make a CmdLine struct */
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NewCmdLine (&L);
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/* Walk over the parameters and add them to the CmdLine struct. Add a
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* special handling for arguments preceeded by the '@' sign - these are
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* actually files containing arguments.
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*/
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for (I = 0; I < *aArgCount; ++I) {
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/* Get the next argument */
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char* Arg = (*aArgVec)[I];
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/* Is this a file argument? */
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if (Arg && Arg[0] == '@') {
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/* Expand the file */
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ExpandFile (&L, Arg+1);
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} else {
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/* No file, just add a copy */
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AddArg (&L, Arg);
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}
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}
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/* Store the new argument list in a safe place... */
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ArgCount = L.Count;
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ArgVec = L.Vec;
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/* ...and pass back the changed data also */
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*aArgCount = L.Count;
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*aArgVec = L.Vec;
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}
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void UnknownOption (const char* Opt)
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/* Print an error about an unknown option and die. */
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{
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AbEnd ("Unknown option: %s", Opt);
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}
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void NeedArg (const char* Opt)
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/* Print an error about a missing option argument and exit. */
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{
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AbEnd ("Option requires an argument: %s", Opt);
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}
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void InvDef (const char* Def)
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/* Print an error about an invalid definition and die */
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{
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AbEnd ("Invalid definition: `%s'", Def);
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}
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const char* GetArg (unsigned* ArgNum, unsigned Len)
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/* Get an argument for a short option. The argument may be appended to the
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* option itself or may be separate. Len is the length of the option string.
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*/
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{
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const char* Arg = ArgVec[*ArgNum];
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if (Arg[Len] != '\0') {
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/* Argument appended */
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return Arg + Len;
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} else {
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/* Separate argument */
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Arg = ArgVec[*ArgNum + 1];
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if (Arg == 0) {
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/* End of arguments */
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NeedArg (ArgVec[*ArgNum]);
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}
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++(*ArgNum);
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return Arg;
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}
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}
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void LongOption (unsigned* ArgNum, const LongOpt* OptTab, unsigned OptCount)
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/* Handle a long command line option */
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{
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/* Get the option and the argument (which may be zero) */
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const char* Opt = ArgVec[*ArgNum];
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/* Search the table for a match */
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while (OptCount) {
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if (strcmp (Opt, OptTab->Option) == 0) {
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/* Found, call the function */
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if (OptTab->ArgCount > 0) {
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/* We need an argument, check if we have one */
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const char* Arg = ArgVec[++(*ArgNum)];
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if (Arg == 0) {
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NeedArg (Opt);
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}
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OptTab->Func (Opt, Arg);
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} else {
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OptTab->Func (Opt, 0);
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}
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/* Done */
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return;
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}
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/* Next table entry */
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--OptCount;
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++OptTab;
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}
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/* Invalid option */
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UnknownOption (Opt);
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}
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