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121
nl.c
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121
nl.c
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#define _POSIX_C_SOURCE 200809L
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <limits.h>
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#include <errno.h>
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int main(int argc, char * argv[]) {
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/*
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Corresponds to -b (0), -f (1), and -h (2).
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0 - -b a; 1 - -b t; 2 - -b n; 3 - -b p<bre>
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number_regex is for -b (0), -f (1), -h (2)
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*/
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int numbering[3] = {1, 2, 2}; char * number_regex[3];
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/*
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delim is the delimiter used for sections specified by -d
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incr is the number of lines to increment numbering by (-i)
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*/
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char delim[3] = "\\:"; int incr = 1;
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/*
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lines corresponds to the -l option
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Only applies w/ -{b,f,h} t; -l 2 would number every
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other blank line (i.e. first blank not numbered,
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second blank numbered)
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format is format for numbering given by -n.
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00 - rn; 01 - ln; 02 - rz
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restart is for -p, don't restart at page delimiters
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1 is don't restart (-p given), 0 is restart (default)
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*/
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int lines = 1; int format = 00; int restart = 0;
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char sep = '\t'; /* Separator of number and line, given by -s */
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int init_val = 1; /* Initial line number, given by -v */
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int width = 6; /* Width of line number given by -w */
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char c; char line[LINE_MAX];
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char ln_format[90]; char format_str[LINE_MAX + 90];
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FILE * file = NULL;
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int cur_section = 2; /* section being printed, as for -b, etc. */
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while((c = getopt(argc, argv, "b:f:h:d:i:l:n:ps:v:w:")) != -1) {
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switch(c) {
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case 'p': restart = 1; break;
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case 'b': switch(optarg[0]) {
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case 'a': numbering[0] = 0; break;
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case 't': numbering[0] = 1; break;
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case 'n': numbering[0] = 2; break;
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case 'p': numbering[0] = 3;
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number_regex[0] = strdup(optarg+1); break;
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} break;
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case 'f': switch(optarg[0]) {
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case 'a': numbering[1] = 0; break;
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case 't': numbering[1] = 1; break;
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case 'n': numbering[1] = 2; break;
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case 'p': numbering[1] = 3;
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number_regex[1] = strdup(optarg+1); break;
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} break;
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case 'h': switch(optarg[0]) {
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case 'a': numbering[2] = 0; break;
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case 't': numbering[2] = 1; break;
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case 'n': numbering[2] = 2; break;
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case 'p': numbering[2] = 3;
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number_regex[2] = strdup(optarg+1); break;
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} break;
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case 'd': delim[0] = optarg[0];
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delim[1] = optarg[1] == '\0' ? ':' : optarg[1]; break;
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case 'i': incr = atoi(optarg); break;
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case 'l': lines = atoi(optarg); break;
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case 'n': format = optarg[0] == 'l' ? 01 : 00;
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format = optarg[1] == 'z' ? format | 02 : format; break;
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case 's': sep = optarg[0];
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case 'v': init_val = atoi(optarg); break;
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case 'w': width = atoi(width); break;
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}
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}
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ln_format[0] = '%';
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ln_format[1] = format & 01 ? '-' : format & 02 ? '0' : '\0';
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sprintf(ln_format + (ln_format[1] == '\0' ? 1 : 2), "%dd", width);
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strcpy(format_str, ln_format);
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strcat(format_str, "%c%s");
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while(file == NULL) {
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file = fopen(argv[optind], "r");
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if(file == NULL) {
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switch(errno) {
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case EACCES: fprintf(stderr, "%s: %s: access denied\n", argv[0], argv[optind]);
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exit(1);
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case EINTR: break;
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case EISDIR: fprintf(stderr, "%s: %s: is a directory\n", argv[0], argv[optind]);
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exit(2);
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case ELOOP: fprintf(stderr, "%s: %s: symlink loop detected\n", argv[0], argv[optind]);
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exit(3);
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case EMFILE:
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fprintf(stderr, "Hi, you shouldn't see this. %s somehow used up all the file descriptors available to it.\n", argv[0]);
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fprintf(stderr, "This is a bug. If you could let us know about it, that'd be much appreciated\n");
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fprintf(stderr, "If you wanna debug, check near line 83 of nl.c. Otherwise, we'll just exit now.\n");
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exit(5);
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case ENAMETOOLONG: fprintf(stderr, "%s: %s: name too long\n", argv[0], argv[optind]);
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exit(6);
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case ENFILE: fprintf(stderr, "%s: too many files open in system", argv[0]);
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exit(7);
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case ENOENT: fprintf(stderr, "%s: %s: file doesn't exist\n", argv[0], argv[optind]);
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exit(8);
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case ENOTDIR: int i = strlen(argv[optind]);
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while(argv[optind][i-1] == '/') { i--; }
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argv[optind][i] = '\0';
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break;
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case ENXIO: fprintf(stderr, "%s: Did you mean to feed a device file to nl?\n", argv[0]);
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fprintf(stderr, "In any case, the device for this file doesn't exist (ENXIO). Sorry :P\n");
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exit(9);
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case EOVERFLOW: fprintf(stderr, "%s: %s: file too big\n", argv[0], argv[optind]);
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exit(4);
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}
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}
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}
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}
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