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Does the wc command strip the trailing line feed from txt files?
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I'm currently building a replica of the wc command line call (in C). I have a file [tst.txt]
and the C code to read that file. The wc tst.txt command responds with the output: 2 6 20 tst.txt, meaning 2 line feeds ('n'). My code, however, counts 3 line feeds. I am assuming this is due to the systematic trailing new line at the end of the file (following Line 3).
Am I correct in thinking that the wc command strips the trailing line feed (by trailing I mean at the EOF), or is a piece of my code incorrect?
Could be that I am incrementing an extra unit?
Here is my code:
#include <stdio.h>
#include <string.h>
int checkForNewLine(char* line, int lineSize);
int main(int argc, char **argv) {
// declare variables
FILE *inputFile; // pointer to inputted file
inputFile = fopen(argv[1], "r"); // set input file to 2nd cmd-line arg.
int newLineCount = 0;
int newLineIncr = 0;
// if file is not found
if (inputFile == NULL){
printf("%s", "File not foundn");
return (-1); // end program
}
char line[201]; // set line to 200 char MAX.
while (fgets(line, 201, inputFile) != NULL){
// new line count
newLineCount = newLineCount + checkForNewLine(line, 201);
}
if (feof(inputFile)) {
}
else {
printf("%s", "Some Other Error...");
}
printf("New Line Count [%d]n", (newLineCount));
fclose(inputFile);
}
int checkForNewLine(char *line, int lineSize){
int count = 0;
for (int i = 0; i < lineSize; i++) {
if (line[i] == ''){
count++;
printf("count amount: %dn", count);
break;
}
}
return count;
}
command-line terminal wc
asked 36 mins ago
slickslick
1
New contributor
slick is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
I'm currently building a replica of the wc command line call (in C). I have a file [tst.txt]
and the C code to read that file. The wc tst.txt command responds with the output: 2 6 20 tst.txt, meaning 2 line feeds ('n'). My code, however, counts 3 line feeds. I am assuming this is due to the systematic trailing new line at the end of the file (following Line 3).
Am I correct in thinking that the wc command strips the trailing line feed (by trailing I mean at the EOF), or is a piece of my code incorrect?
Could be that I am incrementing an extra unit?
Here is my code:
#include <stdio.h>
#include <string.h>
int checkForNewLine(char* line, int lineSize);
int main(int argc, char **argv) {
// declare variables
FILE *inputFile; // pointer to inputted file
inputFile = fopen(argv[1], "r"); // set input file to 2nd cmd-line arg.
int newLineCount = 0;
int newLineIncr = 0;
// if file is not found
if (inputFile == NULL){
printf("%s", "File not foundn");
return (-1); // end program
}
char line[201]; // set line to 200 char MAX.
while (fgets(line, 201, inputFile) != NULL){
// new line count
newLineCount = newLineCount + checkForNewLine(line, 201);
}
if (feof(inputFile)) {
}
else {
printf("%s", "Some Other Error...");
}
printf("New Line Count [%d]n", (newLineCount));
fclose(inputFile);
}
int checkForNewLine(char *line, int lineSize){
int count = 0;
for (int i = 0; i < lineSize; i++) {
if (line[i] == ''){
count++;
printf("count amount: %dn", count);
break;
}
}
return count;
}
command-line terminal wc
asked 36 mins ago
slickslick
1
New contributor
slick is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
I'm currently building a replica of the wc command line call (in C). I have a file [tst.txt]
and the C code to read that file. The wc tst.txt command responds with the output: 2 6 20 tst.txt, meaning 2 line feeds ('n'). My code, however, counts 3 line feeds. I am assuming this is due to the systematic trailing new line at the end of the file (following Line 3).
Am I correct in thinking that the wc command strips the trailing line feed (by trailing I mean at the EOF), or is a piece of my code incorrect?
Could be that I am incrementing an extra unit?
Here is my code:
#include <stdio.h>
#include <string.h>
int checkForNewLine(char* line, int lineSize);
int main(int argc, char **argv) {
// declare variables
FILE *inputFile; // pointer to inputted file
inputFile = fopen(argv[1], "r"); // set input file to 2nd cmd-line arg.
int newLineCount = 0;
int newLineIncr = 0;
// if file is not found
if (inputFile == NULL){
printf("%s", "File not foundn");
return (-1); // end program
}
char line[201]; // set line to 200 char MAX.
while (fgets(line, 201, inputFile) != NULL){
// new line count
newLineCount = newLineCount + checkForNewLine(line, 201);
}
if (feof(inputFile)) {
}
else {
printf("%s", "Some Other Error...");
}
printf("New Line Count [%d]n", (newLineCount));
fclose(inputFile);
}
int checkForNewLine(char *line, int lineSize){
int count = 0;
for (int i = 0; i < lineSize; i++) {
if (line[i] == ''){
count++;
printf("count amount: %dn", count);
break;
}
}
return count;
}
command-line terminal wc
asked 36 mins ago
slickslick
1
New contributor
slick is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I'm currently building a replica of the wc command line call (in C). I have a file [tst.txt]
and the C code to read that file. The wc tst.txt command responds with the output: 2 6 20 tst.txt, meaning 2 line feeds ('n'). My code, however, counts 3 line feeds. I am assuming this is due to the systematic trailing new line at the end of the file (following Line 3).
Am I correct in thinking that the wc command strips the trailing line feed (by trailing I mean at the EOF), or is a piece of my code incorrect?
Could be that I am incrementing an extra unit?
Here is my code:
#include <stdio.h>
#include <string.h>
int checkForNewLine(char* line, int lineSize);
int main(int argc, char **argv) {
// declare variables
FILE *inputFile; // pointer to inputted file
inputFile = fopen(argv[1], "r"); // set input file to 2nd cmd-line arg.
int newLineCount = 0;
int newLineIncr = 0;
// if file is not found
if (inputFile == NULL){
printf("%s", "File not foundn");
return (-1); // end program
}
char line[201]; // set line to 200 char MAX.
while (fgets(line, 201, inputFile) != NULL){
// new line count
newLineCount = newLineCount + checkForNewLine(line, 201);
}
if (feof(inputFile)) {
}
else {
printf("%s", "Some Other Error...");
}
printf("New Line Count [%d]n", (newLineCount));
fclose(inputFile);
}
int checkForNewLine(char *line, int lineSize){
int count = 0;
for (int i = 0; i < lineSize; i++) {
if (line[i] == ''){
count++;
printf("count amount: %dn", count);
break;
}
}
return count;
}
command-line terminal wc
command-line terminal wc
asked 36 mins ago
slickslick
1
New contributor
slick is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 36 mins ago
slickslick
1
New contributor
slick is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 36 mins ago
slickslick
1
New contributor
slick is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 36 mins ago
slickslick
1
asked 36 mins ago
slickslick
1
1
New contributor
slick is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
slick is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
slick is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
add a comment |
1 Answer
1
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oldest
votes
From man 3 fgets:
The fgets() function shall read bytes from stream into the array
pointed to by s, until n−1 bytes are read, or a <newline> is read and
transferred to s, or an end-of-file condition is encountered.
So your code counts the last line, irrespective of whether it had a newline at the end of it (which it doesn't), because EOF was encountered. After all, the checkForNewLine() function is checking for, well, null characters, not newlines. Use od, hexdump, etc. to verify what the last character of your input file is.
answered 6 mins ago
murumuru
38.1k590166
add a comment |
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1 Answer
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1 Answer
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active
oldest
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oldest
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active
oldest
votes
From man 3 fgets:
The fgets() function shall read bytes from stream into the array
pointed to by s, until n−1 bytes are read, or a <newline> is read and
transferred to s, or an end-of-file condition is encountered.
So your code counts the last line, irrespective of whether it had a newline at the end of it (which it doesn't), because EOF was encountered. After all, the checkForNewLine() function is checking for, well, null characters, not newlines. Use od, hexdump, etc. to verify what the last character of your input file is.
answered 6 mins ago
murumuru
38.1k590166
add a comment |
From man 3 fgets:
The fgets() function shall read bytes from stream into the array
pointed to by s, until n−1 bytes are read, or a <newline> is read and
transferred to s, or an end-of-file condition is encountered.
So your code counts the last line, irrespective of whether it had a newline at the end of it (which it doesn't), because EOF was encountered. After all, the checkForNewLine() function is checking for, well, null characters, not newlines. Use od, hexdump, etc. to verify what the last character of your input file is.
answered 6 mins ago
murumuru
38.1k590166
add a comment |
From man 3 fgets:
The fgets() function shall read bytes from stream into the array
pointed to by s, until n−1 bytes are read, or a <newline> is read and
transferred to s, or an end-of-file condition is encountered.
So your code counts the last line, irrespective of whether it had a newline at the end of it (which it doesn't), because EOF was encountered. After all, the checkForNewLine() function is checking for, well, null characters, not newlines. Use od, hexdump, etc. to verify what the last character of your input file is.
answered 6 mins ago
murumuru
38.1k590166
From man 3 fgets:
The fgets() function shall read bytes from stream into the array
pointed to by s, until n−1 bytes are read, or a <newline> is read and
transferred to s, or an end-of-file condition is encountered.
So your code counts the last line, irrespective of whether it had a newline at the end of it (which it doesn't), because EOF was encountered. After all, the checkForNewLine() function is checking for, well, null characters, not newlines. Use od, hexdump, etc. to verify what the last character of your input file is.
answered 6 mins ago
murumuru
38.1k590166
answered 6 mins ago
murumuru
38.1k590166
answered 6 mins ago
murumuru
38.1k590166
answered 6 mins ago
murumuru
38.1k590166
38.1k590166
add a comment |
add a comment |
slick is a new contributor. Be nice, and check out our Code of Conduct.
slick is a new contributor. Be nice, and check out our Code of Conduct.
slick is a new contributor. Be nice, and check out our Code of Conduct.
slick is a new contributor. Be nice, and check out our Code of Conduct.
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