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fixed head

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This commit is contained in:
Your Name 2013-01-18 09:27:24 +00:00
parent 87abbeffa3
commit a3270dd18a
2 changed files with 75 additions and 15 deletions
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1
TODO
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@ -50,6 +50,5 @@ BUGS:
FIX:
ps
head
echo (escape)
que (unicode)

89
src/coreutils/head/head.c
View File

@ -10,46 +10,102 @@
char v_flag;
char c_flag;
char n_flag;
long parse_long(const char *str) {
char *ptr;
long ret = strtol(str, &ptr, 0);
if (*ptr) {
fprintf(stderr, "head: %s invalid number\n", ptr);
fprintf(stderr, "head: invalid number %s\n", ptr);
exit(1);
}
return ret;
}
void print(const char *file, FILE *fp, long lines, long bytes) {
int print(const char *file, FILE *fp, long lines, long bytes) {
if (v_flag)
printf(HEAD_FMT, file);
long lcount = 0;
long bcount = 0;
while (1) {
int c = getc(fp);
bcount++;
if (c == '\n')
lcount++;
/* If lines or bytes < 0 */
if (lines < 0 || bytes < 0) {
long lmax = 0;
long bmax = 0;
if (c == EOF || lcount == lines || (c_flag && bcount == bytes))
break;
size_t buf_size = 0;
char *buf = malloc(1);
if (buf == NULL) {
fprintf(stderr, "head: malloc: %s\n", strerror(errno));
return 1;
}
putchar(c);
while (1) {
int c = getc(fp);
if (c == EOF)
break;
char *tmp = realloc(buf, buf_size + 2);
if (tmp == NULL) {
fprintf(stderr, "head: realloc: %s\n", strerror(errno));
free(buf);
return 1;
}
buf = tmp;
buf[buf_size] = c;
if (c == '\n')
lmax++;
bmax++;
buf_size++;
}
buf[buf_size] = '\0';
for (size_t i = 0; i < buf_size; i++) {
if (buf[i] == '\n')
lcount++;
bcount++;
putchar(buf[i]);
if ((n_flag && lcount == lmax + lines) || (c_flag && bcount == bmax + bytes))
break;
}
free(buf);
}
else {
while (1) {
int c = getc(fp);
if (c == EOF)
break;
if (c == '\n')
lcount++;
bcount++;
putchar(c);
if ((n_flag && lcount == lines) || (c_flag && bcount == bytes))
break;
}
}
return 0;
}
int main(int argc, char **argv) {
long lines = 10;
long lines = 0;
long bytes = 0;
int opt;
while ((opt = getopt(argc, argv, "n:c:v")) != -1) {
switch (opt) {
case 'n':
n_flag = 1;
lines = parse_long(optarg);
break;
@ -63,7 +119,7 @@ int main(int argc, char **argv) {
break;
default:
printf("head [ncv] [file1 file2...]\n\t-n Print N lines\n\t-c Print N bytes\n\t-v Print headers\n");
printf("head [ncv] [file1 file2...]\n\t-n Print [-]N lines\n\t-c Print [-]N bytes\n\t-v Print headers\n");
return 0;
}
}
@ -74,6 +130,7 @@ int main(int argc, char **argv) {
if (argc == 0)
print("-", stdin, lines, bytes);
int ret = 0;
for (int i = 0; i < argc; i++) {
FILE *fp = NULL;
if (argv[i][0] == '-')
@ -84,10 +141,14 @@ int main(int argc, char **argv) {
if (fp == NULL) {
fprintf(stderr, "head: %s: %s\n", argv[i], strerror(errno));
return 1;
ret = 1;
continue;
}
print(argv[i], fp, lines, bytes);
if (print(argv[i], fp, lines, bytes))
ret = 1;
fclose(fp);
}