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[utils.git] / nextep.c
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b2fa28e3
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1#include <stdlib.h>
2#include <stdio.h>
3#include <unistd.h>
4#include <string.h>
5#include <libgen.h>
6#include <errno.h>
7#include <sys/stat.h>
8
9static void usage(FILE *out)
10{
11 fprintf(out, "usage: nextep [-h] [-f FILE] [-s SET-VALUE] [DIR]\n");
12}
13
14int main(int argc, char **argv)
15{
16 int c;
17 char buf[1024], dbuf[1024], *p;
18 char *file, *value, *dir;
19 char base[1024], fpath[1024];
20 FILE *fp;
21
22 file = "nextep";
23 value = NULL;
24 while((c = getopt(argc, argv, "hf:s:")) >= 0) {
25 switch(c) {
26 case 'f':
27 file = optarg;
28 break;
29 case 's':
30 value = optarg;
31 break;
32 case 'h':
33 usage(stdout);
34 exit(0);
35 default:
36 usage(stderr);
37 exit(1);
38 }
39 }
40 if(optind < argc) {
41 if(chdir(argv[optind])) {
42 fprintf(stderr, "nextep: %s: %s\n", argv[optind], strerror(errno));
43 exit(1);
44 }
45 optind++;
46 }
47 if(!getcwd(dbuf, sizeof(dbuf))) {
48 fprintf(stderr, "nextep: getcwd: %s\n", strerror(errno));
49 exit(1);
50 }
51 dir = basename(dbuf);
52 if((p = getenv("HOME")) == NULL) {
53 fprintf(stderr, "nextep: $HOME is not set\n");
54 exit(1);
55 }
56 snprintf(buf, sizeof(buf), "%s/.nextep", p);
57 snprintf(base, sizeof(base), "%s/%s", buf, dir);
58 if(access(base, X_OK)) {
59 if((mkdir(buf, 0777) && (errno != EEXIST)) || mkdir(base, 0777)) {
60 fprintf(stderr, "nextep: %s: %s\n", base, strerror(errno));
61 exit(1);
62 }
63 }
64 snprintf(fpath, sizeof(fpath), "%s/%s", base, file);
65 if(value == NULL) {
66 if((fp = fopen(fpath, "r")) == NULL) {
67 if(errno != ENOENT) {
68 fprintf(stderr, "nextep: %s: %s\n", fpath, strerror(errno));
69 exit(1);
70 }
71 } else {
72 while(fgets(buf, sizeof(buf), fp) != NULL)
73 printf(buf);
74 fclose(fp);
75 }
76 } else if(!*value) {
77 if(unlink(fpath) && (errno != ENOENT)) {
78 fprintf(stderr, "nextep: %s: %s\n", fpath, strerror(errno));
79 exit(1);
80 }
81 } else {
82 if((fp = fopen(fpath, "w")) == NULL) {
83 fprintf(stderr, "nextep: %s: %s\n", fpath, strerror(errno));
84 exit(1);
85 }
86 fprintf(fp, "%s\n", value);
87 fclose(fp);
88 }
89 return(0);
90}
91
92/*
93 * Local Variables:
94 * compile-command: "gcc -Wall -g -o nextep nextep.c"
95 * End:
96 */