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e16a7d8f3b
`et` means `expandtab`. ```sh rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\) et\(.*\) :vi/vi: \1 xoet\2:vi/' rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\)noet\(.*\):vi/vi: \1et\2 :vi/' rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\)xoet\(.*\):vi/vi: \1noet\2:vi/' ```
91 lines
4.2 KiB
C
91 lines
4.2 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ This is free and unencumbered software released into the public domain. │
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│ │
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│ Anyone is free to copy, modify, publish, use, compile, sell, or │
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│ distribute this software, either in source code form or as a compiled │
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│ binary, for any purpose, commercial or non-commercial, and by any │
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│ means. │
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│ │
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│ In jurisdictions that recognize copyright laws, the author or authors │
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│ of this software dedicate any and all copyright interest in the │
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│ software to the public domain. We make this dedication for the benefit │
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│ of the public at large and to the detriment of our heirs and │
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│ successors. We intend this dedication to be an overt act of │
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│ relinquishment in perpetuity of all present and future rights to this │
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│ software under copyright law. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, │
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│ EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF │
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│ MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. │
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│ IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR │
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│ OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, │
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│ ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR │
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│ OTHER DEALINGS IN THE SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/dce.h"
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#include "libc/dns/prototxt.h"
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#include "libc/errno.h"
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#include "libc/fmt/conv.h"
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#include "libc/macros.internal.h"
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#include "libc/mem/mem.h"
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#include "libc/str/str.h"
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/**
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* Opens and searches /etc/protocols to find name for a given number.
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*
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* The format of /etc/protocols is like this:
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*
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* # comment
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* # NAME PROTOCOL ALIASES
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* ip 0 IP
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* icmp 1 ICMP
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*
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* @param protonum is the protocol number
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* @param buf is a buffer to store the official name of the protocol
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* @param bufsize is the size of buf
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* @param path is the location of the protocols file, which may be NULL
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* to use the system-wide default
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* @return 0 on success, -1 on error
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* @note aliases are not read from the file.
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*/
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int LookupProtoByNumber(const int protonum, char *buf, size_t bufsize,
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const char *path) {
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FILE *f;
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int found;
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char *line;
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size_t linesize;
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char pathbuf[256];
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char *name, *number, *comment, *tok;
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if (!bufsize ||
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!(f = fopen(path ? path : GetProtocolsTxtPath(pathbuf, sizeof(pathbuf)),
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"r"))) {
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return -1;
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}
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line = NULL;
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linesize = 0;
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found = 0;
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while (found == 0 && (getline(&line, &linesize, f)) != -1) {
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if ((comment = strchr(line, '#'))) *comment = '\0';
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name = strtok_r(line, " \t\r\n\v", &tok);
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number = strtok_r(NULL, " \t\r\n\v", &tok);
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if (name && number && protonum == atoi(number)) {
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if (!memccpy(buf, name, '\0', bufsize)) {
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strcpy(buf, "");
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break;
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}
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found = 1;
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}
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}
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free(line);
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if (ferror(f)) {
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errno = ferror(f);
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fclose(f);
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return -1;
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}
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fclose(f);
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if (!found) return -1;
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return 0;
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}
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