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txt2html.cpp
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txt2html.cpp
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// txt2html - written by Steve Plimpton, May 2004
// table formatting by Anna Reese, Jul 2004
// Sandia National Labs, www.cs.sandia.gov/~sjplimp
//
// txt2html converts a text file with simple formatting & markup into HTML
// formatting & markup specification is given in README
//
// Syntax: txt2html options file read one file, write to stdout
// txt2html optoins file1 file2 ... read files, write files.html
//
// options:
// -b = add a page-break comment to end of each HTML file
// useful when set of HTML files will be converted to PDF
// -x file = skip a file even if it appears in file list
// specify full file name of input file
// input files are first opened as-is
// if that fails a .txt suffix is added
// output files have an .html suffix added or replaced
// (unless written to stdout)
#include <string>
#include <vector>
#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <cstring>
using namespace std;
#define MAXLINE 1024
// function prototypes
static int next_paragraph(FILE *fp, string &paragraph);
static int index_of_first_char_of_last_word(string &paragraph);
static void process_commands(int flag, string &s, string &pre, string &post);
static void substitute(string &s);
static string td_tag(int currentc);
static long find_n(string &s, int nend, int &n1);
static void file_open(int npair, string &infile, FILE **in, FILE **out);
// global variables for links, tables, lists, all command
vector<string> alias1;
vector<string> alias2;
int nlink;
int tableflag; // makes a table if tb command specified
int rowquit; // number of cols per row if c=N specified (default = 0)
string dwidth; // width for all of the columns
string tabledelim; // speciallized separator
string tablealign; // alignment for the table as an image
string dataalign; // alignment for data in table
string rowvalign; // vertical alignment for table
int ncnum; // # of columns with specified width
vector<int> cnum; // column IDs
vector<string> cwidth; // column widths
int ncalign; // # of columns with specified alignment
vector<int> acolnum; // column IDs
vector<string> colalign ; // column alignment
int ncvalign; // # of columns with specified vertical alignment
vector<int> vacolnum; // column IDs
vector<string> colvalign ; // column vertical alignment
string listflag;
string allflag;
// main program
int main(int narg, char **arg)
{
int npair;
size_t n;
string *infile;
FILE *in,*out;
int style,ifirst,ilast;
string raw,pre,post,body,commands,final;
// parse command-line options and args
// setup list of files to process
// npair = # of files to process
// infile = input file names
if (narg == 1) {
fprintf(stderr,"Syntax: txt2html options file\n");
fprintf(stderr," txt2html options file1 file2 ...\n");
exit(1);
}
int breakflag = 0;
int nskip = 0;
char **skipfiles = NULL;
int iarg = 1;
while (arg[iarg][0] == '-') {
if (strcmp(arg[iarg],"-b") == 0) breakflag = 1;
else if (strcmp(arg[iarg],"-x") == 0) {
skipfiles = (char **) realloc(skipfiles,(nskip+1)*sizeof(char *));
n = strlen(arg[iarg+1]) + 1;
skipfiles[nskip] = new char[n];
strcpy(skipfiles[nskip],arg[iarg+1]);
nskip++;
iarg++;
} else {
fprintf(stderr,"Syntax: txt2html options file\n");
fprintf(stderr," txt2html options file1 file2 ...\n");
exit(1);
}
iarg++;
}
if (narg-iarg == 1) {
npair = 1;
infile = new string[npair];
infile[0] = arg[narg-1];
} else {
npair = narg-iarg;
infile = new string[npair];
for (int i = 0; i < npair; i++) infile[i] = arg[i+iarg];
}
// loop over files
for (int ipair = 0; ipair < npair; ipair++) {
// skip file if matches -x switch
int flag = 0;
for (int i = 0; i < nskip; i++)
if (strcmp(infile[ipair].c_str(),skipfiles[i]) == 0) flag = 1;
if (flag) continue;
// clear global variables before processing file
alias1.clear();
alias2.clear();
nlink = 0;
tableflag = 0;
listflag = "";
allflag = "";
// open files & message to screen
file_open(0,infile[ipair],&in,&out);
fprintf(stderr,"Converting %s ...\n",infile[ipair].c_str());
// scan file for link definitions
// read file one paragraph at a time
// process commands, looking only for link definitions
while ((style = next_paragraph(in,raw))) {
if (style == 2) {
int n = index_of_first_char_of_last_word(raw);
commands = raw.substr(n+1);
process_commands(0,commands,pre,post);
}
raw.erase();
}
// close & reopen files
fclose(in);
file_open(npair,infile[ipair],&in,&out);
// write leading <HTML>
fprintf(out,"<HTML>\n");
// process entire file
// read file one paragraph at a time
// delete newlines when line-continuation char at end-of-line
// process commands for each paragraph
// substitute text for each paragraph
// write HTML to output file
int rstflag = 0;
while ((style = next_paragraph(in,raw))) {
if (rstflag && raw.find("END_RST -->") != string::npos) {
rstflag = 0;
raw.erase();
continue;
} else if (rstflag == 0 && raw.find("<!-- RST") != string::npos) {
rstflag = 1;
raw.erase();
continue;
} else if (rstflag) {
raw.erase();
continue;
}
n = raw.find("\\\n");
while (n < string::npos) {
raw.erase(n,2);
n = raw.find("\\\n");
}
ifirst = raw.find_first_not_of(" \t\n");
ilast = raw.find_last_not_of(" \t\n");
pre.erase();
post.erase();
if (raw[ifirst] == '<' && raw[ilast] == '>') {
body = raw;
} else if (style == 1) {
body = raw;
commands = "p\n";
process_commands(1,commands,pre,post);
substitute(body);
} else {
int n = index_of_first_char_of_last_word(raw);
body = raw.substr(0,n) + "\n";
commands = raw.substr(n+1);
process_commands(1,commands,pre,post);
substitute(body);
}
final = pre + body + post;
fprintf(out,"%s\n",final.c_str());
raw.erase();
}
// write trailing </HTML>
if (breakflag) fprintf(out,"<!-- PAGE BREAK -->\n");
fprintf(out,"</HTML>\n");
// close files
fclose(in);
if (out != stdout) fclose(out);
}
// clean up memory
for (int i = 0; i < nskip; i++) delete [] skipfiles[i];
if (skipfiles) free(skipfiles);
delete [] infile;
}
// return next paragraph as string
// discard leading blank lines
// paragraph is terminated by:
// EOF or blank line or line ending with command that starts with ":"
// return 0 if EOF and no paragraph
// return 1 if no trailing command
// return 2 if trailing command
int next_paragraph(FILE *fp, string &paragraph)
{
char *ptr;
char str[MAXLINE];
int first = 1;
int len = 0;
while (1) {
ptr = fgets(str,MAXLINE,fp);
if (ptr == NULL && first) return 0;
if (ptr == NULL) return 1;
len = strlen(str);
if (len == MAXLINE-1) {
fprintf(stderr,"ERROR: File has too-long a string - increase MAXLINE\n");
exit(1);
}
// check for valid 7-bit ascii characters
bool nonascii = false;
for (int i=0; i < len; ++i) {
char c = str[i];
if (c != '\n' && c != '\t' && (c < ' ' || c > '~'))
nonascii = true;
}
if (nonascii)
fprintf(stderr,"WARNING: Non-portable characters in line: %s",ptr);
if (strspn(str," \t\n") == strlen(str) && first) continue;
if (strspn(str," \t\n") == strlen(str)) return 1;
first = 0;
paragraph += str;
if (paragraph[index_of_first_char_of_last_word(paragraph)] == ':')
return 2;
}
}
// return index of first char in last word of paragraph string
int index_of_first_char_of_last_word(string &paragraph)
{
size_t n = paragraph.find_last_not_of(" \t\n");
size_t m = paragraph.find_last_of(" \t\n",n);
if (m == string::npos) return 0;
else return m+1;
}
// apply commands one after the other to the paragraph
void process_commands(int flag, string &s, string &pre, string &post)
{
size_t start,stop,last;
int narg;
string command;
vector<string> arg;
start = 0;
last = s.find_last_not_of(" \t\n");
if (last == string::npos) return;
while (start <= last) {
// grab a single command with optional arguments
// command = name of command
// narg = # of args
// arg = list of argument strings
stop = s.find_first_of(",( \t\n",start);
if (s[stop] == '(') {
command = s.substr(start,stop-start);
start = stop+1;
narg = 0;
while (1) {
stop = s.find_first_of(",)",start);
if (stop == string::npos) {
fprintf(stderr,"ERROR: No trailing parenthesis in %s\n",s.c_str());
exit(1);
}
arg.resize(narg+1);
arg[narg] = s.substr(start,stop-start);
narg++;
start = stop+1;
if (s[stop] == ')') {
start++;
break;
}
}
} else {
command = s.substr(start,stop-start);
start = stop+1;
narg = 0;
}
// if only in scan mode, just operate on link command
if (flag == 0) {
if (command == "link" && narg == 2) {
// s.erase(s.length()-1,1);
for (int i = 0; i < nlink; i++)
if (alias1[i] == arg[0]) {
fprintf(stderr,"ERROR: Link %s appears more than once\n",
arg[0].c_str());
exit(1);
}
alias1.resize(nlink+1);
alias2.resize(nlink+1);
alias1[nlink] = arg[0];
alias2[nlink] = arg[1];
nlink++;
} else continue;
}
// process the command
if (command == "line") {
pre.append("<HR>");
} else if (command == "p") {
pre.append("<P>");
post.insert(0,"</P>");
} else if (command == "pre") {
pre.append("<PRE>");
post.insert(0,"</PRE>");
} else if (command == "c") {
pre.append("<CENTER>");
post.insert(0,"</CENTER>");
} else if (command == "h1") {
pre.append("<H1>");
post.insert(0,"</H1>");
} else if (command == "h2") {
pre.append("<H2>");
post.insert(0,"</H2>");
} else if (command == "h3") {
pre.append("<H3>");
post.insert(0,"</H3>");
} else if (command == "h4") {
pre.append("<H4>");
post.insert(0,"</H4>");
} else if (command == "h5") {
pre.append("<H5>");
post.insert(0,"</H5>");
} else if (command == "h6") {
pre.append("<H6>");
post.insert(0,"</H6>");
} else if (command == "b") {
post.insert(0,"<BR>");
} else if (command == "ulb") {
pre.append("<UL>");
} else if (command == "ule") {
post.insert(0,"</UL>");
} else if (command == "olb") {
pre.append("<OL>");
} else if (command == "ole") {
post.insert(0,"</OL>");
} else if (command == "dlb") {
pre.append("<DL>");
} else if (command == "dle") {
post.insert(0,"</DL>");
} else if (command == "l") {
pre.append("<LI>");
} else if (command == "dt") {
pre.append("<DT>");
} else if (command == "dd") {
pre.append("<DD>");
} else if (command == "ul") {
listflag = command;
pre.append("<UL>");
post.insert(0,"</UL>");
} else if (command == "ol") {
listflag = command;
pre.append("<OL>");
post.insert(0,"</OL>");
} else if (command == "dl") {
listflag = command;
pre.append("<DL>");
post.insert(0,"</DL>");
} else if (command == "link") {
if (narg == 1) {
string aname = "<A NAME = \"" + arg[0] + "\"></A>";
pre.append(aname);
}
} else if (command == "image") {
if (narg == 1) {
string img = "<IMG SRC = \"" + arg[0] + "\">";
pre.append(img);
} else if (narg == 2) {
string img = "<A HREF = \"" + arg[1] + "\">" +
"<IMG SRC = \"" + arg[0] + "\">" + "</A>";
pre.append(img);
}
} else if (command == "tb") { // read the table command and set settings
tableflag = 1;
string tableborder = "1"; // these are the table defaults
rowquit = 0;
tablealign = "c";
dataalign = "0";
rowvalign = "0";
ncnum = 0;
ncalign = 0;
ncvalign = 0;
cnum.clear();
acolnum.clear();
vacolnum.clear();
cwidth.clear();
colalign.clear();
colvalign.clear();
tabledelim = ",";
string tw = "";
dwidth = "0";
for (int i = 0; i < narg; i++) { // loop through each tb() arg
int tbstop;
string tbcommand;
tbstop = 0;
tbstop = arg[i].find("=");
tbcommand = arg[i].substr(0,tbstop);
int n = arg[i].length();
if (tbstop == -1) {
continue;
} else if (tbcommand == "c") {
string collumn= arg[i].substr (tbstop+1,n-(tbstop+1));
rowquit = atoi(collumn.c_str());
} else if (tbcommand == "s") {
tabledelim= arg[i].substr (tbstop+1,n-(tbstop+1));
} else if (tbcommand == "b") {
tableborder= arg[i].substr (tbstop+1,n-(tbstop+1));
} else if (tbcommand == "w") {
string width = "0";
if (arg[i].substr (n-1,1) == "%") {
string width = arg[i].substr (tbstop+1,n-(tbstop+1));
tw = " WIDTH=\"" + width + "\"";
} else
dwidth = arg[i].substr (tbstop+1,n-(tbstop+1));
} else if (tbcommand == "ea") {
dataalign= arg[i].substr (tbstop+1,n-(tbstop+1));
} else if (tbcommand == "eva") {
rowvalign= arg[i].substr (tbstop+1,n-(tbstop+1));
} else if (tbcommand == "a") {
tablealign= arg[i].substr (tbstop+1,n-(tbstop+1));
} else if (tbcommand.substr(0,2) == "cw") {
string cwnum= tbcommand.substr(2,tbstop-1);
cnum.resize(ncnum+1);
cnum[ncnum] = atoi(cwnum.c_str());
cwidth.resize(ncnum+1);
cwidth[ncnum]= arg[i].substr(tbstop+1,n-(tbstop+1));
ncnum++;
} else if (tbcommand.substr(0,2) == "ca") {
string canum= tbcommand.substr(2,tbstop-1);
acolnum.resize(ncalign+1);
acolnum[ncalign] = atoi(canum.c_str());
colalign.resize(ncalign+1);
colalign[ncalign]= arg[i].substr(tbstop+1,n-(tbstop+1));
ncalign++;
} else if (tbcommand.substr(0,3) == "cva") {
string cvanum= tbcommand.substr(2,tbstop-1);
vacolnum.resize(ncvalign+1);
vacolnum[ncvalign] = atoi(cvanum.c_str());
colvalign.resize(ncvalign+1);
colvalign[ncvalign]= arg[i].substr(tbstop+1,n-(tbstop+1));
ncvalign++;
} else {
fprintf(stderr,
"ERROR: Unrecognized table command %s\n",tbcommand.c_str());
exit(1);
}
tbstop = s.find("=");
}
string align;
if (tablealign=="c") align="center";
else if (tablealign=="r") align="right ";
else if (tablealign=="l") align="left ";
else align="center";
string tablea = "<DIV ALIGN=" + align + ">" ;
pre.append(tablea);
pre.append("<TABLE ");
pre.append(tw);
string border=" BORDER=" + tableborder + " >\n";
pre.append(border);
post.insert(0,"</TD></TR></TABLE></DIV>\n");
} else if (command == "all") {
if (narg == 1) allflag = arg[0];
} else {
fprintf(stderr,"ERROR: Unrecognized command %s\n",command.c_str());
exit(1);
}
}
}
// perform substitutions within text of paragraph
void substitute(string &s)
{
size_t n,m,p;
char c;
string text,link,href;
string punctuation = ".,?!;:()";
// substitute for bold & italic markers
// if preceeded by \ char, then leave markers in text
n = s.find_first_of("[]{}");
while (n != string::npos) {
c = s[n];
if (n > 0 && s[n-1] == '\\') s.erase(n-1,1);
else {
s.erase(n,1);
if (c == '[') s.insert(n,"<B>");
else if (c == ']') s.insert(n,"</B>");
else if (c == '{') s.insert(n,"<I>");
else if (c == '}') s.insert(n,"</I>");
}
n = s.find_first_of("[]{}",n);
}
// substitute for links
n = s.find("\"_");
while (n != string::npos) {
m = s.rfind("\"",n-1);
if (m == string::npos) {
fprintf(stderr,"ERROR: Could not find matching \" for \"_ in %s\n",
s.c_str());
exit(1);
}
p = s.find_first_of(" \t\n",n) - 1;
if (p == string::npos) {
fprintf(stderr,"ERROR: Could not find end-of-link in %s\n",s.c_str());
exit(1);
}
while (s.find_first_of(".,?!;:()",p) == p) p--;
text = s.substr(m+1,n-m-1);
link = s.substr(n+2,p-n-1);
for (int i = 0; i < nlink; i++)
if (alias1[i] == link) {
link = alias2[i];
break;
}
s.erase(m,p-m+1);
href = "<A HREF = \"" + link + "\">" + text + "</A>";
s.insert(m,href);
n = s.find("\"_");
}
// format the paragraph as a table
if (tableflag) {
tableflag = 0;
string DT;
// set up <TR> tag
// alignment for data in rows
string tbalign;
if (dataalign != "0"){
string align;
if (dataalign=="c") align="\"center\"";
else if (dataalign=="r") align="\"right\"";
else if (dataalign=="l") align="\"left\"";
else {
fprintf(stderr,
"ERROR: Unrecognized table alignment argument %s for ea=X\n",
dataalign.c_str());
exit(1);
}
tbalign = " ALIGN=" + align;
} else tbalign="";
// set up vertical alignment for particular columns
string va;
if (rowvalign != "0"){
string valign;
if (rowvalign == "t") valign= "top";
else if (rowvalign == "m") valign= "middle";
else if (rowvalign == "ba") valign= "baseline";
else if (rowvalign == "bo") valign= "bottom";
else {
fprintf(stderr,
"ERROR: Unrecognized table alignment argument %s for eva=X\n",
rowvalign.c_str());
exit(1);
}
va = " VALIGN =\"" + valign + "\"";
} else va="";
//tr_tag is keyword for data in rows
string tr_tag= "<TR" + tbalign + va + ">";
//declare integers to help with counting and finding position
int currentc=0; // current column
int nend = 0;
int n1=0;
long n = find_n(s,nend,n1);
// if there are no separators, go to the end of the string
if (n < 0) n = s.length();
// while n exists:
while (n != static_cast<long>(string::npos)) {
// ignore = 0 when pass by \n because looking for delimiters only
// when ignore==0 do not put in a <tr>
int ignore=1;
// For each loop starts nend at n
nend=n;
// current column is 0, (very first loop), insert first <TR>
if (currentc == 0){
currentc++;
DT=td_tag(currentc);
s.insert(0,tr_tag);
s.insert(tr_tag.length(),DT);
nend=nend+tr_tag.length()+DT.length();
n = find_n(s,nend,n1);
if (n==n1) currentc++;
else {
// currentc will remain one if rowquit==0
if (rowquit>0){
s.erase(n,1);
n = find_n(s,nend,n1);
currentc++;
}
}
} else {
// if n is separator
if (n == n1){
s.erase(n,tabledelim.length());
if(currentc==(rowquit+1)&& rowquit!=0){
s.insert(nend,"</TD></TR>\n");
nend=nend+11;
// set current column back to one to start new line
currentc=1;
}else{
DT= td_tag(currentc);
s.insert (nend,"</TD>");
nend=nend+5;
s.insert (nend,DT);
nend=nend+DT.length();
// add one so current column is updated
currentc++;
n = find_n(s,nend,n1);
}
}
//if n is newline character
else{
s.erase(n,1);
// if columns == 0 means ARE searching for newlines
// else erase and ignore insert <tr> later and
// search for next separator
if (rowquit==0){
s.insert(nend,"</TD></TR>\n");
nend=nend+11;
// set current column back to one to start new line
currentc=1;
}else{
ignore=0;
n = find_n(s,nend,n1);
}
}
// if we are at the beginning of the row then insert <TR>
if (currentc==1&&ignore) {
DT = td_tag(currentc); // find DT for currentc=1
s.insert(nend,tr_tag);
nend=nend+tr_tag.length();
s.insert(nend,DT);
n = find_n(s,nend,n1); // search for next separator
currentc++;
}
} // end to else statement
} // end to while loop
} // end to if tableflag
// if listflag is set, put list marker at beginning of every line
if (listflag != "") {
string marker;
int toggle = 0;
n = s.find('\n');
while (n != string::npos) {
m = s.rfind('\n',n-1);
if (listflag == "dl" && toggle == 0) marker = "<DT>";
else if (listflag == "dl" && toggle == 1) marker = "<DD>";
else marker = "<LI>";
if (m == string::npos) s.insert(0,marker);
else s.insert(m+1,marker);
n = s.find('\n',m+1);
n = s.find('\n',n+1);
if (toggle) toggle = 0;
else toggle = 1;
}
listflag = "";
}
// if allflag is set, add markers to every line
if (allflag != "") {
string marker1,marker2;
if (allflag == "p") {
marker1 = "<P>";
marker2 = "</P>";
} else if (allflag == "c") {
marker1 = "<CENTER>";
marker2 = "</CENTER>";
} else if (allflag == "b") {
marker1 = "";
marker2 = "<BR>";
} else if (allflag == "l") {
marker1 = "<LI>";
marker2 = "";
} else marker1 = marker2 = "";
n = s.find('\n');
while (n != string::npos) {
m = s.rfind('\n',n-1);
if (m == string::npos) s.insert(0,marker1);
else s.insert(m+1,marker1);
n = s.find('\n',m+1);
s.insert(n,marker2);
n = s.find('\n',n);
n = s.find('\n',n+1);
}
allflag = "";
}
}
// open input file as-is or as file.txt
// if npair = 0, don't open output file (is just initial pass thru input)
// if npair = 1, open output file as stdout
// if npair > 1, open output file with .html suffix
// either replace .txt in input file, or append .html
void file_open(int npair, string &infile, FILE **in, FILE **out)
{
*in = fopen(infile.c_str(),"r");
if (*in == NULL) {
string root = infile;
infile = infile + ".txt";
*in = fopen(infile.c_str(),"r");
if (*in == NULL) {
fprintf(stderr,"ERROR: Could not open %s or %s\n",
root.c_str(),infile.c_str());
exit(1);
}
}
if (npair == 0) return;
else if (npair == 1) *out = stdout;
else {
string outfile;
size_t pos = infile.rfind(".txt");
if (pos == infile.length()-4) outfile = infile.substr(0,pos) + ".html";
else outfile = infile + ".html";
*out = fopen(outfile.c_str(),"w");
if (*out == NULL) {
fprintf(stderr,"ERROR: Could not open %s\n",outfile.c_str());
exit(1);
}
}
}
// for tables:
// build <TD> string (DT) based on current column
string td_tag(int currentc) {
// eacolumn gives the alignment printout of a specific column
string eacolumn;
// va gives vertical alignment to a specific column
string va;
// DT is the complete <td> tag, with width and align
string DT;
// dw is the width for tables. It is also the <dt> tag beginning
string dw;
// set up alignment for particular columns
for (int counter=0; counter < ncalign; counter++){
if (ncalign != 0 && acolnum[counter] == currentc){
string align;
if (colalign[counter] == "l") align= "left";
else if (colalign[counter] == "r") align= "right";
else if (colalign[counter] == "c") align= "center";
else {
fprintf(stderr,
"ERROR: Unrecognized table alignment argument %s for caM=X\n",
colalign[counter].c_str());
exit(1);
}
eacolumn= " ALIGN =\"" + align +"\"";
}else eacolumn= "";
}
// set up vertical alignment for particular columns
for (int counter=0; counter < ncvalign; counter++){
if (ncvalign != 0 && vacolnum[counter] == currentc){
string valign;
if (colvalign[counter] == "t") valign= "top";
else if (colvalign[counter] == "m") valign= "middle";
else if (colvalign[counter] == "ba") valign= "baseline";
else if (colvalign[counter] == "bo") valign= "bottom";
else {
fprintf(stderr,
"ERROR: Unrecognized table alignment argument %s for cvaM=X\n",
colvalign[counter].c_str());
exit(1);
}
va = " VALIGN =\"" + valign + "\"";
} else va = " ";
}
// put in special width if specified
// new code
// if dwidth has not been set, dw is blank
// if dwidth has been set, dw has that... unless
if (dwidth=="0") dw = " ";
else dw =" WIDTH=\""+ dwidth + "\"";
for (int counter = 0; counter < ncnum; counter++){
// if it is the right column, dw = cwidth property
if (cnum[counter] == currentc) dw= " WIDTH=\"" + cwidth[counter] + "\"";
}
// DT is set for all of this particular separator : reset next separator
DT = "<TD" + dw + eacolumn + va + ">";
return DT;
}
// for tables:
// find the next separator starting at nend(the end of the last .insert)
// if there is either a delim or newline
// decide which is first
// set n = to that position
// nsep is position of the next separator. changes in here.
long find_n(string &s, int nend, int &nsep)
// nsep is position of the next separator. changes in here.
{
long n;
nsep = s.find(tabledelim,nend);
long n2 = s.find('\n',nend);
long m = s.length() - 1;
if (nsep >= 0 && n2 >= 0) {
if (nsep <= n2) n = nsep;
else n = n2;
} else {
if (nsep >= 0) n = nsep;
else{
if (n2 < m) n = n2;
else n = string::npos;
}
}
return n;
}

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