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https://github.com/git/git
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![Junio C Hamano](/assets/img/avatar_default.png)
This mechanically converts strncmp() to use prefixcmp(), but only when the parameters match specific patterns, so that they can be verified easily. Leftover from this will be fixed in a separate step, including idiotic conversions like if (!strncmp("foo", arg, 3)) => if (!(-prefixcmp(arg, "foo"))) This was done by using this script in px.perl #!/usr/bin/perl -i.bak -p if (/strncmp\(([^,]+), "([^\\"]*)", (\d+)\)/ && (length($2) == $3)) { s|strncmp\(([^,]+), "([^\\"]*)", (\d+)\)|prefixcmp($1, "$2")|; } if (/strncmp\("([^\\"]*)", ([^,]+), (\d+)\)/ && (length($1) == $3)) { s|strncmp\("([^\\"]*)", ([^,]+), (\d+)\)|(-prefixcmp($2, "$1"))|; } and running: $ git grep -l strncmp -- '*.c' | xargs perl px.perl Signed-off-by: Junio C Hamano <junkio@cox.net>
234 lines
4.8 KiB
C
234 lines
4.8 KiB
C
/*
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* builtin-help.c
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*
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* Builtin help-related commands (help, usage, version)
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*/
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#include "cache.h"
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#include "builtin.h"
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#include "exec_cmd.h"
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#include "common-cmds.h"
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#include <sys/ioctl.h>
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/* most GUI terminals set COLUMNS (although some don't export it) */
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static int term_columns(void)
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{
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char *col_string = getenv("COLUMNS");
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int n_cols;
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if (col_string && (n_cols = atoi(col_string)) > 0)
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return n_cols;
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#ifdef TIOCGWINSZ
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{
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struct winsize ws;
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if (!ioctl(1, TIOCGWINSZ, &ws)) {
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if (ws.ws_col)
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return ws.ws_col;
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}
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}
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#endif
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return 80;
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}
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static void oom(void)
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{
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fprintf(stderr, "git: out of memory\n");
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exit(1);
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}
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static inline void mput_char(char c, unsigned int num)
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{
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while(num--)
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putchar(c);
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}
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static struct cmdname {
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size_t len;
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char name[1];
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} **cmdname;
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static int cmdname_alloc, cmdname_cnt;
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static void add_cmdname(const char *name, int len)
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{
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struct cmdname *ent;
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if (cmdname_alloc <= cmdname_cnt) {
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cmdname_alloc = cmdname_alloc + 200;
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cmdname = realloc(cmdname, cmdname_alloc * sizeof(*cmdname));
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if (!cmdname)
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oom();
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}
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ent = malloc(sizeof(*ent) + len);
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if (!ent)
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oom();
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ent->len = len;
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memcpy(ent->name, name, len);
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ent->name[len] = 0;
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cmdname[cmdname_cnt++] = ent;
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}
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static int cmdname_compare(const void *a_, const void *b_)
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{
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struct cmdname *a = *(struct cmdname **)a_;
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struct cmdname *b = *(struct cmdname **)b_;
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return strcmp(a->name, b->name);
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}
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static void pretty_print_string_list(struct cmdname **cmdname, int longest)
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{
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int cols = 1, rows;
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int space = longest + 1; /* min 1 SP between words */
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int max_cols = term_columns() - 1; /* don't print *on* the edge */
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int i, j;
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if (space < max_cols)
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cols = max_cols / space;
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rows = (cmdname_cnt + cols - 1) / cols;
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qsort(cmdname, cmdname_cnt, sizeof(*cmdname), cmdname_compare);
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for (i = 0; i < rows; i++) {
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printf(" ");
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for (j = 0; j < cols; j++) {
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int n = j * rows + i;
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int size = space;
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if (n >= cmdname_cnt)
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break;
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if (j == cols-1 || n + rows >= cmdname_cnt)
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size = 1;
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printf("%-*s", size, cmdname[n]->name);
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}
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putchar('\n');
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}
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}
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static void list_commands(const char *exec_path, const char *pattern)
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{
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unsigned int longest = 0;
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char path[PATH_MAX];
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int dirlen;
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DIR *dir = opendir(exec_path);
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struct dirent *de;
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if (!dir) {
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fprintf(stderr, "git: '%s': %s\n", exec_path, strerror(errno));
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exit(1);
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}
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dirlen = strlen(exec_path);
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if (PATH_MAX - 20 < dirlen) {
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fprintf(stderr, "git: insanely long exec-path '%s'\n",
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exec_path);
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exit(1);
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}
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memcpy(path, exec_path, dirlen);
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path[dirlen++] = '/';
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while ((de = readdir(dir)) != NULL) {
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struct stat st;
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int entlen;
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if (prefixcmp(de->d_name, "git-"))
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continue;
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strcpy(path+dirlen, de->d_name);
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if (stat(path, &st) || /* stat, not lstat */
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!S_ISREG(st.st_mode) ||
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!(st.st_mode & S_IXUSR))
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continue;
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entlen = strlen(de->d_name);
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if (has_extension(de->d_name, ".exe"))
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entlen -= 4;
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if (longest < entlen)
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longest = entlen;
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add_cmdname(de->d_name + 4, entlen-4);
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}
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closedir(dir);
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printf("git commands available in '%s'\n", exec_path);
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printf("----------------------------");
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mput_char('-', strlen(exec_path));
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putchar('\n');
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pretty_print_string_list(cmdname, longest - 4);
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putchar('\n');
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}
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static void list_common_cmds_help(void)
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{
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int i, longest = 0;
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for (i = 0; i < ARRAY_SIZE(common_cmds); i++) {
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if (longest < strlen(common_cmds[i].name))
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longest = strlen(common_cmds[i].name);
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}
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puts("The most commonly used git commands are:");
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for (i = 0; i < ARRAY_SIZE(common_cmds); i++) {
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printf(" %s ", common_cmds[i].name);
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mput_char(' ', longest - strlen(common_cmds[i].name));
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puts(common_cmds[i].help);
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}
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puts("(use 'git help -a' to get a list of all installed git commands)");
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}
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static void show_man_page(const char *git_cmd)
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{
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const char *page;
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if (!prefixcmp(git_cmd, "git"))
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page = git_cmd;
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else {
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int page_len = strlen(git_cmd) + 4;
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char *p = xmalloc(page_len + 1);
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strcpy(p, "git-");
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strcpy(p + 4, git_cmd);
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p[page_len] = 0;
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page = p;
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}
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execlp("man", "man", page, NULL);
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}
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void help_unknown_cmd(const char *cmd)
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{
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printf("git: '%s' is not a git-command\n\n", cmd);
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list_common_cmds_help();
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exit(1);
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}
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int cmd_version(int argc, const char **argv, const char *prefix)
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{
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printf("git version %s\n", git_version_string);
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return 0;
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}
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int cmd_help(int argc, const char **argv, const char *prefix)
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{
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const char *help_cmd = argc > 1 ? argv[1] : NULL;
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const char *exec_path = git_exec_path();
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if (!help_cmd) {
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printf("usage: %s\n\n", git_usage_string);
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list_common_cmds_help();
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exit(1);
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}
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else if (!strcmp(help_cmd, "--all") || !strcmp(help_cmd, "-a")) {
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printf("usage: %s\n\n", git_usage_string);
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if(exec_path)
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list_commands(exec_path, "git-*");
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exit(1);
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}
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else
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show_man_page(help_cmd);
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return 0;
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}
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