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/*******************************************************************/
/* slibtool: a skinny libtool implementation, written in C */
/* Copyright (C) 2016--2018 Z. Gilboa */
/* Released under the Standard MIT License; see COPYING.SLIBTOOL. */
/*******************************************************************/
#ifndef _POSIX_C_SOURCE
#define _POSIX_C_SOURCE 200809L
#endif
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include "slibtool_errinfo_impl.h"
#include "slibtool_mapfile_impl.h"
static void slbt_munmap(void * addr, size_t size)
{
if (addr) {
munmap(addr,size);
}
}
struct slbt_map_info * slbt_map_file(
int fdat,
const char * path,
uint32_t flags)
{
int fd;
void * addr;
struct stat st;
uint32_t oflag;
uint32_t mprot;
struct slbt_map_info * mapinfo;
if ((flags & SLBT_MAP_INPUT) && (flags & SLBT_MAP_OUTPUT)) {
oflag = O_RDWR;
mprot = PROT_READ|PROT_WRITE;
} else if (flags & SLBT_MAP_INPUT) {
oflag = O_RDONLY;
mprot = PROT_READ;
} else if (flags & SLBT_MAP_OUTPUT) {
oflag = O_WRONLY;
mprot = PROT_WRITE;
} else {
errno = EINVAL;
return 0;
}
if ((fd = openat(fdat,path,oflag,0)) < 0)
return 0;
if (fstat(fd,&st) < 0) {
close(fd);
return 0;
}
addr = st.st_size
? mmap(0,st.st_size,mprot,MAP_SHARED,fd,0)
: 0;
if (addr == MAP_FAILED) {
close(fd);
return 0;
}
if (!(mapinfo = malloc(sizeof(*mapinfo)))) {
close(fd);
slbt_munmap(addr,st.st_size);
return 0;
}
close(fd);
mapinfo->addr = addr;
mapinfo->size = st.st_size;
mapinfo->mark = addr;
mapinfo->cap = &mapinfo->mark[st.st_size];
return mapinfo;
}
void slbt_unmap_file(struct slbt_map_info * mapinfo)
{
slbt_munmap(mapinfo->addr,mapinfo->size);
free(mapinfo);
}
int slbt_mapped_readline(
const struct slbt_driver_ctx * dctx,
struct slbt_map_info * mapinfo,
char * buf,
size_t buflen)
{
const char * ch;
const char * cap;
const char * mark;
const char * newline;
size_t len;
mark = mapinfo->mark;
cap = mapinfo->cap;
for (ch=mark, newline=0; ch<cap && !newline; ch++)
if (*ch == '\n')
newline = ch;
len = ch - mark;
if (newline && (buflen <= len))
return SLBT_CUSTOM_ERROR(dctx,SLBT_ERR_FLOW_ERROR);
if (!newline)
return SLBT_CUSTOM_ERROR(dctx,SLBT_ERR_BAD_DATA);
memcpy(buf,mark,len);
buf[len] = 0;
mapinfo->mark += len;
return 0;
}
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