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https://github.com/eddyem/eddys_snippets.git
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98 lines
2.5 KiB
C
98 lines
2.5 KiB
C
/*
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* comments_before.c - put multiline comments before text in string they follow
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*
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*
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* Copyright 2015 Edward V. Emelianov <eddy@sao.ru, edward.emelianoff@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*/
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#include <stdio.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <sys/mman.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <string.h>
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typedef struct{
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char *data;
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size_t len;
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} mmapbuf;
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mmapbuf *My_mmap(char *filename){
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int fd;
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char *ptr;
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size_t Mlen;
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struct stat statbuf;
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if(!filename) exit(-1);
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if((fd = open(filename, O_RDONLY)) < 0) exit(-2);
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if(fstat (fd, &statbuf) < 0) exit(-3);
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Mlen = statbuf.st_size;
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if((ptr = mmap (0, Mlen, PROT_READ, MAP_PRIVATE, fd, 0)) == MAP_FAILED)
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exit(-4);
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if(close(fd)) exit(-5);
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mmapbuf *ret = calloc(1, sizeof(mmapbuf));
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ret->data = ptr;
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ret->len = Mlen;
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return ret;
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}
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int main(int argc, char **argv){
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mmapbuf *buf = My_mmap(argv[1]);
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char *afile = strdup(buf->data), *eptr = afile + buf->len;
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char *beforecom = NULL;
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while(afile < eptr){
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char *nl = strchr(afile, '\n');
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if(!nl){
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printf("%s\n", afile);
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return 0;
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}
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*nl++ = 0;
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char *commstart = strstr(afile, "/*");
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if(commstart){
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*commstart = 0;
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free(beforecom);
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beforecom = strdup(afile);
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commstart += 2;
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char *commend = NULL;
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if(*commstart) commend = strstr(commstart, "*/");
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if(commend){ // single comment
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*commend = 0;
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afile = commend + 2;
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printf("/* %s */\n", commstart);
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printf("%s%s\n", beforecom, afile);
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afile = nl;
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}else{ // multiline comment
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printf("/*%s\n", commstart);
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commend = strstr(nl, "*/");
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if(!commend){
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printf("%s*/\n", nl);
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return -1;
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}
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*commend = 0;
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afile = commend + 2;
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if(*afile == '\n') ++afile;
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printf("%s*/\n", nl);
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}
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}else{
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printf("%s\n", afile);
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afile = nl;
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}
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}
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}
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