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//
// input.c
//
// Shell input
//
// Copyright (C) 2011 Michael Ringgaard. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
// 3. Neither the name of the project nor the names of its contributors
// may be used to endorse or promote products derived from this software
// without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
// OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
// OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
// SUCH DAMAGE.
//
#include "sh.h"
int pushfile(struct inputfile **file, int fd) {
struct inputfile *inp;
if (fd == -1) return 0;
inp = (struct inputfile *) malloc(sizeof(struct inputfile));
if (!inp) return -1;
inp->prev = *file;
inp->lineno = 1;
inp->fd = fd;
inp->buf = inp->ptr = inp->end = NULL;
*file = inp;
return 0;
}
int pushstr(struct inputfile **file, char *str) {
struct inputfile *inp;
char *newstr;
if (!str) return 0;
newstr = strdup(str);
if (!newstr) return -1;
inp = (struct inputfile *) malloc(sizeof(struct inputfile));
if (!inp) return -1;
inp->prev = *file;
inp->lineno = 1;
inp->fd = -1;
inp->buf = inp->ptr = newstr;
inp->end = inp->buf + strlen(newstr);
*file = inp;
return 0;
}
int popfile(struct inputfile **file) {
struct inputfile *inp;
inp = *file;
if (!inp) return 0;
if (inp->fd != -1) close(inp->fd);
if (inp->buf) free(inp->buf);
*file = inp->prev;
free(inp);
return 0;
}
void popallfiles(struct inputfile **file) {
while (*file) popfile(file);
}
int pgetc(struct inputfile **file, int peek) {
while (*file) {
struct inputfile *inp = *file;
if (inp->ptr != inp->end) {
if (peek) {
return *inp->ptr;
} else {
int ch = *(inp->ptr)++;
if (ch == '\n') inp->lineno++;
return ch;
}
}
if (inp->fd != -1) {
int rc;
if (!inp->buf) inp->buf = inp->ptr = inp->end = malloc(FILEBUFSIZ);
if (!inp->buf) return -1;
rc = read(inp->fd, inp->buf, FILEBUFSIZ);
if (rc < 0) {
return -1;
} else if (rc == 0){
if (popfile(file) < 0) return -1;
} else {
inp->ptr = inp->buf;
inp->end = inp->buf + rc;
}
} else {
if (popfile(file) < 0) return -1;
}
}
return -1;
}