PostgreSQL Source Code  git master
pg_get_line.c File Reference
#include "postgres.h"
#include <setjmp.h>
#include "common/string.h"
#include "lib/stringinfo.h"
Include dependency graph for pg_get_line.c:

Go to the source code of this file.

Functions

char * pg_get_line (FILE *stream, PromptInterruptContext *prompt_ctx)
 
bool pg_get_line_buf (FILE *stream, StringInfo buf)
 
bool pg_get_line_append (FILE *stream, StringInfo buf, PromptInterruptContext *prompt_ctx)
 

Function Documentation

◆ pg_get_line()

char* pg_get_line ( FILE *  stream,
PromptInterruptContext prompt_ctx 
)

Definition at line 59 of file pg_get_line.c.

60 {
62 
64 
65  if (!pg_get_line_append(stream, &buf, prompt_ctx))
66  {
67  /* ensure that free() doesn't mess up errno */
68  int save_errno = errno;
69 
70  pfree(buf.data);
71  errno = save_errno;
72  return NULL;
73  }
74 
75  return buf.data;
76 }
void pfree(void *pointer)
Definition: mcxt.c:1169
bool pg_get_line_append(FILE *stream, StringInfo buf, PromptInterruptContext *prompt_ctx)
Definition: pg_get_line.c:124
static char * buf
Definition: pg_test_fsync.c:69
void initStringInfo(StringInfo str)
Definition: stringinfo.c:59

References buf, initStringInfo(), pfree(), and pg_get_line_append().

Referenced by get_su_pwd(), and simple_prompt_extended().

◆ pg_get_line_append()

bool pg_get_line_append ( FILE *  stream,
StringInfo  buf,
PromptInterruptContext prompt_ctx 
)

Definition at line 124 of file pg_get_line.c.

126 {
127  int orig_len = buf->len;
128 
129  if (prompt_ctx && sigsetjmp(*((sigjmp_buf *) prompt_ctx->jmpbuf), 1) != 0)
130  {
131  /* Got here with longjmp */
132  prompt_ctx->canceled = true;
133  /* Discard any data we collected before detecting error */
134  buf->len = orig_len;
135  buf->data[orig_len] = '\0';
136  return false;
137  }
138 
139  /* Loop until newline or EOF/error */
140  for (;;)
141  {
142  char *res;
143 
144  /* Enable longjmp while waiting for input */
145  if (prompt_ctx)
146  *(prompt_ctx->enabled) = true;
147 
148  /* Read some data, appending it to whatever we already have */
149  res = fgets(buf->data + buf->len, buf->maxlen - buf->len, stream);
150 
151  /* Disable longjmp again, then break if fgets failed */
152  if (prompt_ctx)
153  *(prompt_ctx->enabled) = false;
154 
155  if (res == NULL)
156  break;
157 
158  /* Got data, so update buf->len */
159  buf->len += strlen(buf->data + buf->len);
160 
161  /* Done if we have collected a newline */
162  if (buf->len > orig_len && buf->data[buf->len - 1] == '\n')
163  return true;
164 
165  /* Make some more room in the buffer, and loop to read more data */
166  enlargeStringInfo(buf, 128);
167  }
168 
169  /* Check for I/O errors and EOF */
170  if (ferror(stream) || buf->len == orig_len)
171  {
172  /* Discard any data we collected before detecting error */
173  buf->len = orig_len;
174  buf->data[orig_len] = '\0';
175  return false;
176  }
177 
178  /* No newline at EOF, but we did collect some data */
179  return true;
180 }
void enlargeStringInfo(StringInfo str, int needed)
Definition: stringinfo.c:283
volatile bool * enabled
Definition: string.h:19

References buf, PromptInterruptContext::canceled, PromptInterruptContext::enabled, enlargeStringInfo(), PromptInterruptContext::jmpbuf, and res.

Referenced by pg_get_line(), pg_get_line_buf(), and tokenize_file().

◆ pg_get_line_buf()

bool pg_get_line_buf ( FILE *  stream,
StringInfo  buf 
)

Definition at line 95 of file pg_get_line.c.

96 {
97  /* We just need to drop any data from the previous call */
99  return pg_get_line_append(stream, buf, NULL);
100 }
void resetStringInfo(StringInfo str)
Definition: stringinfo.c:75

References buf, pg_get_line_append(), and resetStringInfo().

Referenced by convert_sourcefiles_in(), ecpg_filter_source(), ecpg_filter_stderr(), readfile(), SortTocFromFile(), and tsearch_readline().